Ryu Ho-sun and Choi Hwa-jin are set to have arranged marriage, but she disappears during their wedding. Choi Ki Wan pretends and dresses up as a woman.

Aspiring filmmaker Hyunsu offers Miju a role, and they fall in love. As time passes, Miju grows tired of his dreaming while she struggles at work. A fight leads them to experience different July 7ths, leaving their future uncertain.

Cheerful runner Sang Ha loves sprinting, while Jin Won chases marathon glory. Paired as pacemaker, their rivalry sparks unexpected feelings.

Hong Il Tak, the bottom of Daemun Boy's High School, must survive by befriending the strongest guy.