“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?