Ma Dong-chan (played by Ji Chang-wook) is an accomplished producing director. His latest project is the Frozen Human Project and he takes part in it as well as one of the participants. Together with Go Mi-ran (played by Won Jin-ah), Ma Dong-chan enters the frozen capsule for 24 hours. Due to an unexpected accident, the capsule disappears along with Professor Hwang who is in charge of this research. 20 years went by, when Ma Dong-chan and Go Mi-ran wake up from the capsule, everyone else around them has aged by 20 years except them. Ma Dong-chan's girlfriend, Na Ha-yeong (played by Yoon Se-ah) has become the newsroom director. She firmly believes that the accident that took place 20 years ago is deliberate....

Based on a popular web novel of the same name published in 2017. It tells the sweet love story between a lovely senior and a bold junior who is sexy and sincere....