With their bodies mysteriously swapped, the twins hatch a plan to save Woo-jae. But to change his fate, they must first turn him into a national team athlete.

Even after changing the past, Woo-jae dies again while saving Ha-na. As Ha-na falls into despair, Ha-ru suggests a new way to change their fate.

Woo-jae becomes a judo champion but is confused when he starts developing feelings for Ha-na in Ha-ru’s body.

The twins travel back to their college days and regain their original bodies. After discovering Woo-jae is majoring in security and protection, they search for a way to change the future.

A love triangle forms as Woo-jae and Hyeong-won compete for the same person, while someone discovers the twins’ secret of time travel.

Someone who knows the secret of time travel deliberately hid the camcorder. The twins’ investigation points to Hyeong-won.

The twins return to 2026, where Woo-jae has become an actor and turns his back on Ha-na. Meanwhile, Ha-na receives a mysterious screenplay.

The twins discover that Jun-mo is the culprit. To protect Woo-jae, Ha-na decides to break free from Jun-mo and give up her acting career.

The twins piece together the events after discovering Jun-mo’s true identity, while Jun-mo threatens Woo-jae, demanding that he bring him the camcorder.