“My Sweet Mobster” is a new romantic drama with a surprising storyline starring Um Tae Goo as Seo Ji Hwan, Seo Ji Hwan is a man overcoming his troubled past, and Han Sun Hwa as Go Eun Ha is a children's content creator. while Kwon Yool plays Jang Hyun Woo, a prosecutor at the Seoul Central District Prosecutors' Office and Go Eun Ha's loyal customer. Seo Ji Hwan, who is now the CEO of Instant Food, then with his strange behavior falls in love with Go Eun Ha. On the other hand, Go Eun Ha always shadows Jang Hyun Woo, her childhood friend.