Shin Sol-i isn't shy about her unrequited crush on Cha Heon, her next-door neighbor. One day, she gets an idea to write him the perfect love letter.

A romantic drama about a man and a woman who, due to a misunderstanding, have held a crush on each other for over 10 years.

Adapted from the webtoon series "Welcome", this TV series tells the story of graphic designer Kim Sol Ah who brings home a cat, unaware that the animal can turn into a human being.