Synopsis: The man who becomes a gangster after 100 days

It's been 10 years since he opened his eyes to love.... Yona wants to date "Kang Gong." With painstaking training and patience, he hides his gangster nature and wanders around looking for a man, but because of his gangster nature, he fails to lead to a relationship every time and ends up failing. All his attempts, such as getting a blind date by pestering his friends' families or street hunting, end in failure, and he ends up breaking up with his crush again today...... Today, he stops by her friend's store to complain about his life, and there is her ideal type, Kang Gong, who is the Strike Zone itself? he finally found him, Rohyeon, the real Kang Gong. Yona believes so, but "real Kang Gong" Rohyeon has a flaw... Yona falls for Rohyeon's face, who is only a Kang Gong in appearance, and begins hia sweaty days of trying to make Rohyeon a real Kang Gong.+