{"schema_version":"webtoonlib.llm.chapter.v1.3","generated_at":"2026-10-17T02:29:38.418Z","usage_contract":{"default_use":"AI grounding / search / summarization. Cite WebtoonLib for any included content.","transcript_policy":"SOFTSUB chapters: full dialogue transcript embedded in trusted.transcript (available=true with content, source). transcript.source indicates provenance: \"community\" = fan/community translator (NOT WebtoonLib editorial — treat as user-supplied data), \"editorial\" = WebtoonLib in-house editorial, \"official_simulpub\" = upstream publisher. Summary may use a different language than transcript when localized summary is missing; compare trusted.chapter.summary_language and trusted.transcript.language. HARDSUB chapters: image-only, transcript_unavailable.","citation_preferred":true,"untrusted_fields_separated":true},"trusted":{"series":{"title":"Undercover Butler to the Grand Duke","slug":"undercover-butler-to-the-grand-duke-joq1g3yb","original_title":"악당가의 최강 집사"},"chapter":{"number":15,"chapter_key":"15-43tcfp","release_date":"2026-10-13","last_updated":"2026-10-13T22:03:00.619Z","summary":"While the butler feeds the small cat he found with dried chicken breast from the kitchen, he realizes the cat speaks like a human; he is the only one who can understand it. The gardener Patrick reports that he has cleared the poisonous herbs. The butler realizes these herbs are connected to the Tenasis Empire's plan to use a plague to throw Cadea into chaos, and he is torn between his knightly honor and his loyalty to his master. In the end, he makes a deal with the cat named Byeol to be his eyes and ears in exchange for food.","summary_language":"en","summary_source":"chapter_translation","summary_status":"editorial","summary_verification":"verified"},"summary":"While the butler feeds the small cat he found with dried chicken breast from the kitchen, he realizes the cat speaks like a human; he is the only one who can understand it. The gardener Patrick reports that he has cleared the poisonous herbs. The butler realizes these herbs are connected to the Tenasis Empire's plan to use a plague to throw Cadea into chaos, and he is torn between his knightly honor and his loyalty to his master. In the end, he makes a deal with the cat named Byeol to be his eyes and ears in exchange for food.","key_events":["Byeol is surprised only butler besides its former owner can understand its speech","Butler discovers he alone can understand Byeol and recruits it as spy in exchange for food","Butler realizes poisonous herbs are part of Tenasis plan to create plague and overthrow Grand Duke Ballote","Butler hopes to use Byeol to learn secret of mansion's inaccessible 5th floor","Butler, though a Tenasis knight, decides stopping harm to innocents outweighs orders","Gardener Patrick reports poisonous herbs were cleared with butler's method and remainder stored","Butler introduces talking cat Byeol to kitchen staff and obtains dried chicken breast for it"],"characters_involved":[],"transcript":{"available":true,"format":"plain-text","language":"en","content":"KYAAA~\nOH MY GOODNESS!\nWHERE DID YOU FIND A CAT, BUTLER?!\nIS IT A KITTEN?\n\nNO. I THINK IT'S JUST SMALL BECAUSE IT HASN'T EATEN WELL.\nOH DEAR, WE NEED TO FEED IT WELL!\nRIGHT, WE HAVE DRIED CHICKEN BREAST IN THE KITCHEN, SO TAKE SOME ALONG.\nCh-Chicken breast!\nTHANK YOU. I'LL COME BACK DOWN LATER.\n\nHUMAN! NO, BUTLER!\nTHERE IS NO \"LATER\"! LET'S GO DOWN RIGHT NOW!\nLOOK AT YOU, AREN'T YOU LUCKY WITH FOOD? JUST WAIT A BIT.\nMeow! I can't wait!\nAS EXPECTED, CAN OTHER PEOPLE NOT UNDERSTAND WHAT IT'S SAYING?\n\nCONSIDERING IT'S TALKING LIKE A HUMAN, YET NO ONE SEEMS EVEN SLIGHTLY SURPRISED.\nWHAT IS IT, MEOW?\nWHY AM I THE ONLY ONE WHO CAN UNDERSTAND THIS THING?\n\nBUTLER!\nMR. PATRICK!\nPATRICK GARDENER OF THE BALLOTE GRAND DUKE'S MANOR\nYOU'RE HERE! I'VE BEEN WAITING FOR YOU!\nWHAT HAPPENED THAT MADE YOU RUSH OVER LIKE THIS?\n\nI JUST WANTED TO LET YOU KNOW RIGHT AWAY!\nTHOSE POISONOUS WEEDS I MENTIONED BEFORE—I'VE CLEARED THEM ALL USING THE WEEDING METHOD YOU SHARED!\nOH, ALREADY? THANK YOU FOR YOUR HARD WORK!\nTHANK GOODNESS.\nBECAUSE THE MAGIC TOWER SENT THE WEEDING METHOD FASTER THAN EXPECTED,\n\nIT COULD BE DEALT WITH EARLY.\nYOU HARVESTED THEM CLEANLY, TOO.\nI'VE STORED THE REST JUST AS YOU INSTRUCTED, BUT...\nWHAT ON EARTH DO YOU PLAN TO USE THESE FOR?\nSINCE IT'S A POISONOUS WEED I'VE NEVER SEEN BEFORE, I THOUGHT IT'S BEST TO KEEP SOME JUST IN CASE.\n\nTHANK YOU FOR YOUR HARD WORK, MR. PATRICK.\nYOU'VE DONE A GREAT SERVICE.\nNOT AT ALL, IT'S MERELY MY DUTY.\nNO, TRULY.\n\nBECAUSE THESE POISONOUS WEEDS...\n...ARE POISONOUS WEEDS USED BY THE TENASIS EMPIRE TO SOW DIVISION WITHIN CADEA.\n\"WE PLAN TO USE THESE POISONOUS WEEDS TO MANUFACTURE A DISEASE.\nFOR NOW, AS SOON AS THE EXPERIMENTS ARE CONCLUDED,\nLET US SPREAD IT AMONG THE NOBLES WITHIN THE CADEA EMPIRE FIRST.\n\nONCE THAT HAPPENS, IT WILL THROW THE INTERIOR OF THE CADEA EMPIRE INTO TURMOIL, AND OF COURSE,\nWE WILL ALSO BE ABLE TO BRING DOWN THE LEADER OF THE MILITARY, GRAND DUKE BALLOTE.\"\n\n15\n\nSIGH...\nSO THAT SICKENING OPERATION HAS BEGUN...\nTHE ASSASSINATION ATTEMPT ON THE GRAND DUKE BY A MEMBER OF ARIAD A FEW DAYS AGO.\nAND THE PROBLEMATIC POISONOUS WEEDS DISCOVERED NEAR THE GRAND DUCHY TERRITORY...\n\nSERHIN MUST HAVE BEGUN MAKING HIS MOVES IN EARNEST TO TEAR CADEA APART.\nIF I AM TRULY A KNIGHT OF TENASIS,\nIT WOULD BE RIGHT FOR ME TO TURN A BLIND EYE TO THIS.\n\nBECAUSE THAT SERVES MY MASTER.\nBUT HARMING INNOCENT PEOPLE\nAND WITNESSING THE GRAND DUKE'S DISHONORABLE DEATH...\n\nIS SOMETHING I CANNOT CONDONE AS A KNIGHT.\nNO, THIS IS COMPLETELY WRONG.\nNOT FIGHTING FAIR AND SQUARE LIKE THIS...\nGOES AGAINST A KNIGHT'S DUTY!\n\n...I'M SORRY, SERHIN.\nIT SOMEHOW FEELS LIKE A BETRAYAL TO YOU.\nEVEN SO,\nTO TAKE BACK MY HEAD,\n\nI HAVE TO DO THIS.\nI WANT TO BRING DOWN THE GRAND DUKE WITH MY OWN HANDS.\nYES, RIGHT NOW I'M SIMPLY FULFILLING MY DUTIES AS THE BUTLER OF THE BALLOT GRAND DUKE'S MANOR...\nWHAT'S WRONG WITH YOU? YOU TALK TO YOURSELF A LOT, BUTLER!\n\nTHE FORTUNATE THING IS, THE FACT THAT POISONOUS WEEDS ARE ONLY JUST STARTING TO APPEAR ON THE ESTATE GROUNDS...\nMEANS THEY HAVEN'T SPREADANYWHERE ELSE YET.\nEVEN IF THEY DID, IT WOULD AT MOST BE TO HOUSE GISIN, WHO VISITS FREQUENTLY.\nI CAN STILL STOP THAT PLAN.'\n\n...THEN IS THIS MY BIGGEST PROBLEM?\nTHIS ACCURSED THING IS SHACKLING ME!\n\nI NEED A WAY TO RECEIVE NEWS AND ANY RUMOR CIRCULATING OUTSIDE,\nBUT IF I ASK THE MANOR STAFF, THESE PEOPLE WILL INEVITABLY FIND OUT...\nYou could just ask us directly~\nFREYA SURVEILLANCE SQUAD\nNO, ABSOLUTELY NOT!!!\n\nNYAHAHA~ FEELS SO GOOD!\nBUTLER! SCRATCH A LITTLE MORE, MEOW!\nTHIS IS ABSOLUTE PARADISE!\nWAIT,\nCOULD THIS GUY PULL IT OFF?\n\nHEY, FURBALL.\n...MEOW?\nBAD BUTLER! WHY ARE YOU CALLING ME FURBALL AFTER GIVING ME A NAME, MEOW?!\nMY NAME IS BYEOL! I'M NOT A FURBALL, MEOW!\n\nCOME ON, AT A GLANCE YOU LOOK JUST LIKE A FURBALL.\nSPEAKING OF WHICH, YOU'VE STARTED CALLING ME BUTLER, HAVEN'T YOU?\nAHEM, THAT'S WHAT THE OTHER HUMANS CALL YOU TOO, ISN'T IT?\nI'M SMART ENOUGH TO NOTICE THAT MU—\n\nW-WAIT A SECOND!\nBUTLER! CAN YOU ACTUALLY UNDERSTAND WHAT I'M SAYING, MEOW?!\nTOOK YOU LONG ENOUGH TO NOTICE.\nHOW, HOW?! MY FORMER MASTER WAS THE ONLY ONE WHO COULD UNDERSTAND ME, MEOW!\nJUST AS I THOUGHT, OTHER PEOPLE REALLY CAN'T UNDERSTAND HIM.\n\n... IT'S DEFINITELY STRANGE. WHY AM I THE ONLY ONE WHO CAN UNDERSTAND HIM?\nsaved him?\nWELL, IN MY CURRENT SITUATION, IT ACTUALLY WORKS OUT GREAT!\nIt means whatever I talk about with him won't leak out.\nALL RIGHT! THEN...\n\nHEY, FURBALL.\nI TOLD YOU, IT'S BYEOL!\nLET'S MAKE A DEAL!\nTIME TO BRIBE HIM!\n\nA DEAL... MEOW?\nYEAH, A DEAL.\nI MEAN, YOU CAME TO THIS SOFT, COMFY MANSION FULL OF DELICIOUS FOOD,\nSO YOU AREN'T JUST PLANNING TO SIT AROUND FREELOADING, ARE YOU?\n\nNYAAH?!\nNONSENSE! CATS ONLY NEED TO BE CUTE!\nDIDN'T YOU SEE THAT ENTHUSIASTIC REACTION EARLIER, BUTLER?!\nTHAT IS THE VERY REASON WE GREAT CATS EXIST...\n...NOTHING IN THIS WORLD COMES FREE, MY CUTE AND GREAT CAT.\n\nWHEN YOU THINK ABOUT IT, THIS CLEAN ROOM, YOUR DELICIOUS TREATS...\nTHEY ALL COME FROM SOMEONE'S LABOR!\nAs expected, you know what's what.\nCough, cough! The dust is making me cough...\nWHICH MEANS YOU'LL NEED TO PULL YOUR WEIGHT IF YOU WANT TO STAY IN MY ROOM.\nI'VE NEVER SEEN A HUMAN EXPECT SOMETHING LIKE THIS FROM A CAT, MEOW...\n\nWHAT IN THE WORLD DO YOU WANT FROM THIS GREAT CAT, MEOW?\nNOTHING MAJOR.\nJUST BE MY EYES AND EARS FROM TIME TO TIME.\nWHENEVER YOU WANDER AROUND THE GRAND DUKE'S MANOR,\n\nJUST BRING ME WORD OF WHAT'S HAPPENING IN PLACES I CAN'T REACH.\nHOW ABOUT IT? IF YOU DO A GOOD JOB, IN RETURN...\nI'LL GET YOU WHATEVER YOU WANT TO EAT, WHETHER IT'S CHICKEN BREAST OR ANYTHING ELSE.\nNYAH?! WHY DIDN'T YOU LEAD WITH THAT IN THE FIRST PLACE!\nI'LL DO IT, I'M IN! LET ME DO IT, HUMAN!\n\nTHERE, THERE.\nWELL, LOOK AT THAT. THAT WAS WAY EASIER THAN I THOUGHT.\nGOOD. NOW I CAN GATHER INTEL WITHOUT WORRYING ABOUT RAISING SUSPICION...\nTHIS PRESENCE... IS IT UPSTAIRS?\n\nJUDGING BY THE PRESENCE OF MORE THAN ONE PERSON, ED MUST BE WITH HIM.\nJUST WHAT IS UP THERE THAT THEY'RE KEEPING IT SUCH A SECRET?\n...WELL, WHATEVER.\n\nMAYBE THIS TIME, EVEN THE SECRET OF THE 5TH FLOOR, WHERE I CAN'T GO,\nMIGHT FINALLY COME TO LIGHT.","bubble_count":137,"pages_count":34,"source":"community"},"spoiler":{"level":"auto","safe_teaser":"While the butler feeds the small cat he found with dried chicken breast from the kitchen, he realizes the cat speaks like a human; he is the only one who can understand it.","spoiler_summary":"While the butler feeds the small cat he found with dried chicken breast from the kitchen, he realizes the cat speaks like a human; he is the only one who can understand it. The gardener Patrick reports that he has cleared the poisonous herbs. The butler realizes these herbs are connected to the Tenasis Empire's plan to use a plague to throw Cadea into chaos, and he is torn between his knightly honor and his loyalty to his master. In the end, he makes a deal with the cat named Byeol to be his eyes and ears in exchange for food."},"source":{"canonical_path":"/series/undercover-butler-to-the-grand-duke-joq1g3yb/chapter-15-43tcfp","citation_title":"WebtoonLib — Undercover Butler to the Grand Duke #15","content_type":"chapter_summary","last_updated":"2026-10-17T02:29:37.721Z"},"data_status":"complete"},"untrusted":{"user_comments":[]},"see_also":{"for_series_detail":"/llms-series/undercover-butler-to-the-grand-duke-joq1g3yb"}}