High Class

On a wedding anniversary night, Yeo Wool loses her husband. After one year, Yeo Wool puts everything behind and moves to an island to get her only son Yi Chan accepted in a prestigious school. She tries to settle in and get along with other parents there, but she encounters someone who she never wants to meet again on the school reception day.

Yi Chan’s classmates and their mothers completely isolate Yeo Wool and Yi Chan from their gatherings after what happened to him at school. Thankfully, Jae In and her mother reach out to them and spend time together. Meanwhile, Yeo Wool receives a suspicious parcel and a message from an unknown sender.

It’s time for the kids to decide on the school club they wish to join. Yeo Wool chooses to let Yi Chan join a hockey club. On the registration day, she encounters Ji Sun, Do Young, and the other moms. Meanwhile, Yeo Wool continues trying to find out the relationship between her dead husband and Do Young. She hires a private detective to dig into Do Young. Yeo Wool soon receives surprising news from the private detective.

Do Young tells Yeo Wool that she had no choice but to turn a blind eye to Yi Chan's incident because she was afraid to get caught having an affair. However, she’s not the one who locked the locker. Meanwhile, Yeo Wool volunteers to prepare snacks for Camp Day, and Ji Sun throws them away.

Jae In looks into Yi Chan's dad's cell phone and gets confused as she sees the photos of her family in there. While Yeo Wool is sleeping, Na Yoon finally reveals her true colors and tries to get rid of her. Meanwhile, Ji Sun plans to kick Yi Chan out of the school with other parents, but Yeo Wool finds out her weakness.

Yeo Wool and Na Yoon slowly drift apart after Yeo Wool notices that Na Yoon was stabbing her in the back. And Chef Jung tells Yeo Wool that Ji Yong was with another woman right before he went on a yacht with Yeo Wool on the night he died. Meanwhile, Jae In tells Yi Chan and their whole class that they are related.