Unfortunately this recommendation is a spoiler.

Same messages about learning to love life and find those who care about you through a game administered by death its self.

Watch for the romance similarites
Similarities:
Office romance, Cold aloof male, Sexual tension
Differences:
Different jobs, because the tvn show is a short it is much more romance focused where as Behind every star is more plot focused
Watch the TvN show if you liked the relationship between the manager and the tax guy.

Vibes are less rom-comy but has some similar sexual tension and developing deeper romance.
There are multiple couples/ storylines in The Jungle and one does take place in an office setting.

Set in 1980-90s, nostalgia feeling in shows. Old school romance. Twinkling watermelon has a slightly more modern feel but both satisfy the romance old school vibes.

End of world monster mutation survival story. I think both have quite similar monster cgi portrayals. The main character is able to control his inner monster in some way.

Both are Dark Sexual Dramas that has multiple storylines and a flirtatious group of boys.
Playboyy has a bit more mystery and plot to the story where as The Jungle has more individual character development plot focus.
Playboyy is a BL while The Jungle has only straight couples.

The style of how games are set up are quite similar. Squid game has some more mental challenges compared to physical 100 which as the title suggests is based on the physical strength of contestants. However, individual and team work are involved in both shows.

Alice in Borderland is a better version of Squid Game. Mental and Physical challenges are involved in both however Alice In Borderland has a better back story as to why players are in the games rather than just for money.

Very similar plots. Characters have to complete games in order to survive these games involve both brawn and brains to win. Sometimes you have to turn on your fellow players in order to win.

Apocalyptic world that requires both skill and brains to survive another day and sometimes forces you to turn on your friends.
Differences would be that in Sweet Home the obstacles are super strong monsters.