主人翁阿給（侯彥西飾演）是一個不切實際又沒有擔當的年輕人，一晚在淡水河邊救回一名年輕男子，沒想到這人竟然說他是阿給失蹤20多年的父親——1990年號稱「亞洲小情人」的偶像團體「奶油起司」的歌星Bony（吳慷仁飾演）。他說自己當年被阿給的媽媽（苗可麗飾演）趕出家門後誤闖時光裂縫，因而來到2014年。他希望快點找出回到1990年的辦法，卻一直被別人當作神經病。而這段「超時空團圓」，也讓Bony和阿給與他的家人也鬧出不少笑話。好不容易終於讓家人們相信了他的故事，並且諒解他20年來的缺席，但Bony最後能不能成功回到過去，真的彌補失去的時光？

College student Gei (Hou Yan Xi) lives with his mom Zhen Ying (Miao Ke Li) in Tamsui. His father, nineties idol Bone, disappeared 24 years ago, leaving behind a half-written song. Because of this, Zhen Ying won't let Gei play the guitar or pursue rock music, leading to constant arguments between the two. Though he has no money himself, Gei is always trying to help out his buddies, and even secretly uses his mother's property to guarantee his friend's debt. One day, after enraging both his mom and girlfriend (Beatrice Fang), Gei gets super drunk and on his way home, he sees a man crying for help in Tamsui River. Gei rescues the man (Chris Wu) and finds that he looks exactly like his father! Bony's sudden arrival changes the family in unexpected ways, even as he constantly badgers Gei to help him return to the past.