It's the season 1 of this show!
Groups that participated in the S1: Ladies' code, Kard, Day6, f(x), Btob

Both the drama leads are a divorced couple..
Both the couple were once married happily but are sadly divorced
Both the couples see each other every day which kinda makes them reconcile.
Both the genres are comedy and romance.

Both are P1Harmony's show. They do fun activities and mission in both the shows. It's really funny and they compete with each other in teams.

Both dramas features a divorced couple falling in love again!
It is a fmaily drama with comedy and romance, both dramas have innocent romance!

- FL transferred from another school (she had an ugly past) and becomes famous in her new school for her beauty because she transformed herself.
- Cold outside but warm inside ML
- Both ML are idol actors

Similarities
> High school romance
> BoyLove
> ML is a lonely since childhood, has not experienced friendship
> ML falls in love at the first sight

Both dramas are revenge themed
The main character goes to large extent just to get their revenge, and gets hurt again and again..

Both have humans who turn into monsters.
The world facing a huge human crisis.

Both are historical dramas.
The female lead pretends to be a eunuch (disguised herself as a man).

King eternal has the parallel dimension storyline, when I saw "Tomorrow I'll meet the yesterday you", this drama came to my mind. Both has fated love partner. In both the shows, They save eachother through the different time portals and parallel dimensions!

In "The Clue", The Male lead with the help of female lead finds who murdered a boy from his class within a period.

The female leads in both the dramas are disguised as a male. Both are set in ancient times.
Suzy's character in Gu Family Book is a girl who never goes anywhere without her sword and prefers to pass for a boy