Yi-hyeok and Inseo have been grown up together since they were born. They have been so close that it feels like they probably knew each other in their past lives. They consider the other as their best friends for their whole lives. It’s something they take as obvious things. Or, at least, that’s what they think until Inseo kisses Yi-hyeok through recreating old photos challenge. That evolves their friendship into something new, with strange feelings gradually emerge between them. They’re still friends, despite the fact that it’s very humorous, very steamy, and a little unusual, aren’t they?