"𝑰 𝒘𝒐𝒖𝒍𝒅'𝒗𝒆 𝒌𝒊𝒍𝒍𝒆𝒅 𝒎𝒚 𝒔𝒆𝒍𝒇 𝒐𝒖𝒕 𝒐𝒇 𝒃𝒐𝒓𝒆𝒅𝒐𝒎 𝒊𝒇 𝒊𝒕 𝒘𝒂𝒔𝒏'𝒕 𝒇𝒐𝒓 𝒚𝒐𝒖." When Ha Eun Gyeol stumbles across a strange yet alluring music store, he goes hurtling back in time to 1995, and comes face to face with his father Ha Yi Chan - as a high schooler, and eventually he joins a band fronted by his future father, in a bid to put things right . He also encounters a particular female that, in contrast to all his dad's acquaintances he recognised, he had never heard of her. Nevertheless, this girl is really precious to his father; they are diaper friends, and she has been present for him long before Chung Ah and SeKyung. Therefore, EunGyeol will thus do everything within his power to find out why she completely vanished from their lives to come. kang Hyeon Yeol > female mc.