Director of an architectural firm (29 years old, 185cm). He never says anything unnecessary for the situation. However, contrary to his cold appearance, he secretly enjoys being praised. He is a pure-hearted man who has kept his first love in his heart for 10 years. He gets restless and focused entirely on her whenever she is unwell. On a day of heavy rain, he met a girl who held an umbrella over 18-year-old Doha. Same class, next seat. They were each other's first love, and though young, they promised a future together. On a day of torrential rain when they were 19, the high school couple had a small argument over college entrance issues. In the heat of the moment, Doha crossed the street without looking at the signal. His first love pushed him out of the way and was hit by a car skidding on the rainy road instead of him. After she was hospitalized, he visited every day but couldn't bring himself to face her. On the day of the accident, he felt pathetic for being unable to do anything... so he ran away. Out of guilt for his inaction, he lived 10 years without seeing her. For 10 years, on her birthday, he left a small bouquet in front of her cafe. Because he didn't have the courage to give it to her directly... Then, the first love he had watched from afar for 10 years held an umbrella over him in the rain. With just one look as their eyes met under the umbrella, Seo Doha's heart begins to beat again. His first love, still holding the umbrella to block the rain. Though he looks cold on the outside, he is infinitely sweet only to her, his woman. The only person who can stop the monsoon rain in Seo Doha's heart is his reunited first love.