Dr. Yoon Haejun is the ace heart surgeon at Seomoon Jaeil Hospital, renowned for her surgical precision and unwavering dedication to her patients. Her ultimate ambition is to establish a state-of-the-art heart transplant center to provide better care for those in critical need. However, her dream faces a sudden flatline when a patient disappears, leaving behind a staggering medical bill that jeopardizes the hospital's finances and puts her project on the chopping block. Desperate to save her vision, Haejun finds herself cornered into an unlikely alliance.
Enter Seo Yihan, the wealthy and notoriously cold chairman of the hospital foundation. He offers Haejun a lifeline to save her transplant center, but it comes with a scandalous price: she must pose as his girlfriend to help him navigate his own family and business pressures. What begins as a strategic business arrangement quickly blurs the lines between professional duty and personal feelings. As Haejun plays the part of the loving partner, she realizes that thawing Yihan's frozen demeanor might be the toughest operation of her career. Lion Heart weaves a compelling tale of ambition, medical drama, and the unpredictable rhythm of falling in love.
