“I found out. If you don’t know your first love, is that love?” Oh Yoon, a childhood friend of Do Dam, visits him as his daily life is interrupted by his first love who has become a stalker. Unlike the past when he followed his older sister around, he is just being awkward… . A woman who hates her first love and a man who came looking for his first love. The days he misses, his first love he misses. Who was their true love?