*This work is a re-publication of <21℃ - The Temperature of the Cold Bath>, originally published by another company in 2019. *Some sentences have been revised, and additional side stories are included. At the café 'Diving' run by Seolhae, Seojin has been coming and going for some time now. As the two get to know each other's personalities, they often spend the night together, but for some reason, they can't confirm each other's feelings...... Seojin, who has been hurt by love, and Seolhae, for whom love is difficult. In a world where everyone is expected to be passionate, what temperature do Seojin and Seolhae have?