Kang Min spent years trapped in a miserable marriage with his childhood friend, Choi Min-kyung, enduring her constant verbal abuse and feeling like nothing more than a burden.

Then, after wishing for it all to end, he wakes up in 2017, the first year of high school.

He's been given another chance at life.

Unfortunately, so has Min-kyung.

When Kang Min realizes his ex-wife has regressed along with him, he makes one decision clear from the start: whatever happened in their first life, they're not going through it again.

Min-kyung, however, seems to have a very different idea about how their second chance should go.