Sorry Not Sorry - Season 1

Ji Song-yi found herself a divorced woman, burdened by debt so huge she couldn't even afford a wedding ceremony. Then, her sister Eun-gyu returns from New York without warning, leaving Song-yi with the unexpected responsibility of taking her young nephew, Jay, to English kindergarten. Soon, everyone believes Song-yi is Jay's mother.

Song-yi's ex-boyfriend from college, Seok Jin-ho, lives upstairs, and at the English kindergarten, she runs into her ex-best friend, Ha-na, who suddenly starts acting friendly. Ha-na, a working mom, is dealing with a crisis at work, and Song-yi unexpectedly finds herself taking care of Ha-na's kids. This helps them overcome the awkwardness that had grown between them.

While doing "couples counseling" with her ex-boyfriend Jin-ho, Song-yi learns about the secret hobby of his wife, Chan-yang. Yi-an, the cafe owner, suggests an after-work hangout with Song-yi, but this leads to a misunderstanding with Hyeon-woo, a divorce lawyer, who sees them together.

Song-yi goes to a motel to help Jin-ho but ends up getting entangled with Hyeon-woo again. At the English kindergarten's Father's Day event, cafe owner Yi-an joins in, and a sports day takes place amidst the competitive spirit of the kindergarten moms.

Song-yi, hoping to spark a new romance, joins a running club. She's surprised to find Hyeon-woo there, and on the way home from the after-run gathering, they mistake Ha-na's husband, Seong-tae, for an escaped convict. The three of them end up unexpectedly catching the real fugitive together.

Ha-na finds out about Seong-tae's cryptocurrency debt, prompting Song-yi to invite her for a temporary stay. Wanting to help, Song-yi arranges a counseling session for Ha-na with Hyeon-woo, the divorce attorney. While accompanying Ha-na to the session, Song-yi unexpectedly learns something about Hyeon-woo's past.

Song-yi is flustered by Yi-an's kiss. The Dumpling Couple influencer incident in Cheonpo New Town causes a rift between the Elousha moms. Meanwhile, Song-yi starts working at Hyeon-woo's law office, and they grow closer as they understand each other better.

Hyeon-woo wakes up at Song-yi's house and is warmly welcomed by her family. He even gets invited to a 60th birthday party. At the party, his ex-boyfriend, Ju-han, shows up, and thanks to a secret between Eun-gyu and Song-yi, the whole celebration turns into chaos.

Rumors that Song-yi and Eun-gyu are a lesbian couple spread like wildfire among the mothers at the English kindergarten. Chan-yang confides in Song-yi and Ha-na that she's seriously considering getting pregnant, and Ha-na unexpectedly learns a personal secret about Ethan's mom.

The real estate agent is coming to see the house, and Song-yi is in a flurry of activity, trying to make the place look its best. But underneath her excitement, she's worried about having to leave Cheonpo. She's strangely attached to the place. When Hyeon-woo hears about it, he finally understands his true feelings for her.

Song-yi is thrilled at the thought of leaving Cheonpo, and Ethan's mom's divorce is also finalized. But when everything feels like a clean slate, a sense of unease lingers. She and Hyeon-woo seem to be on the same page, but a quirk of fate isn't finished with her yet.

Song-yi wants to sell her house and leave Cheonpo, but the sale isn't going as planned, and she keeps avoiding Cha Hyeon-woo. Meanwhile, Chan-yang and her husband's hopes for a baby lead them to an unplanned childcare adventure, thanks to Ha-na's soon-to-arrive third child.