Don't Hesitate(망설이지마)

Jang Soo-hyun was a woman who'd previously devoted her life to love, even donating her liver to save her first love, but was rewarded by betrayal. Since then, she has become jaded and resolved to distance herself from relationships. Until she meets Han Tae-woo, a man who has never known or believed in love. Tae-woo had built a wall around his heart in fear of being hurt again, but Soo-hyun becomes someone whom he learns to sacrifice everything for.