Grieving the loss of a best friend she couldn't protect, an ex-bodyguard sets out to fulfill her dear friend's last wish: sweet revenge.

Hee-yeon, a dedicated high-school teacher, seems to be going well with her life. But soon she faces personal challenges with infertility and home construction issues. To make matters worse, her student, Yu-mi, becomes pregnant. Under her colleague’s pressure, she reluctantly advises her to quit school thinking it’s best. However, her own unexpected pregnancy overturns the whole situation. Hee-yeon starts to open up to Yu-mi and go through something she had never felt before.

The veteran detective Seo Do-cheol and his team at Major Crimes, relentless in their pursuit of criminals, join forces with rookie cop Park Sun-woo to track down a serial killer who has plunged the nation into turmoil.

When an old collaborator gets severely injured, a veteran policeman tries to figure out the way to bring to justice the ultimately suspected aggressor, a spoiled young executive, heir to a mega corporation, who believes he is above the law.

The awkward, distant, and wounded three sisters gather at their hometown for their father's birthday. However, on the day of the party, there is a big mess because of their little brother Jin-seob's abnormal behavior, and the past of the three sisters slowly reveals.

After losing her laundry store to a fire incident, a single mom Duk-hee receives a call from a bank offering a generous upfront loan so she takes it right away. But soon after, she finds out that she has become a victim of a voice phishing scheme. Devastated, Duk-hee turns to the police for help, only to be more disappointed that there is no hope of retrieving her money. At the moment of despair, Jae-min, the phisher who tricked her, rings her phone once again to tip Duk-hee off about the criminal organization that locked him up and coerced him to make voice phishing calls from China. With that call, Duk-hee makes up her mind to investigate this case for herself and take a plane to China with her friends.

A former volleyball star, Woo-jin has been struggling to keep his children’s volleyball school that’s about to go out of business. Left without much choice, he agrees to coach a women’s volleyball team that is the unquestioned worst in the league with only secondrate players and an eccentric club owner. According to Woo-jin’s contract, all he needs to do is win just ‘one’ game.