The spring Seo Dal-mi lost everything, Nam Do-san's letters kept her company. Fifteen years later, she needs him by her side to prove Won In-jae wrong.

To preserve Dal-mi's past and to support her future, Choi Won-deok asks Han Ji-pyeong to pull off an impossible task.

Ji-pyeong scrambles to transform Do-san into the man of Dal-mi's dreams. A rude awakening prompts In-jae to close one door and open another.