- both are workplace romcoms
- formerly married main leads(time travel is the tool used to un-marry them here)
- Jang Seung Jo stars as a side character(ML's dorky, adorable best friend)

30 But 17 has almost the same free-spirited, adorkable vibes. Antisocial ML and FL who is a 17 year old stuck in a 30 year old's body. It has the same light feeling throughout.

Similar setting, with the ML's house acting as a sort of "base" for the rest of the cast to be one big happy family. Because of all these crazy characters, ML thaws out and it's all so cute. The cast is made up of brilliant actors, just like this one - lots of them are seriously popular now - Shin Hye Sun as the FL... Lee Do Hyun(supporting character) and Ahn Hyo Seop(SML) are still young babies in this ??. And the housekeeper, Jennifer, is one of THE most iconic characters in Kdramaland. one of the best drama endings ever.

- Rich ML likes being alone and keeps talking about how he loves staying alone, but ends up with a hilarious, dorky, heartwarming little family... Both ML's hugeass houses serve as their bases. Everyone is practically living together.
- Both FLs are kickass, smart, hardworking characters who are also adorably sweet and kind
- Both MLs are extremely dorky sweethearts underneath but keep an ultra-cool, elegant, astute facade in front of the rest of the world. Only their inner circle family see them in pouty baby mode.
- Easy blend of physical and dialogue comedy that works very well

- similar Korean mythological elements, explains the whole ghost thing pretty well
- lots of very humanlike ghosts and spirits
- similar trio of male lead-female lead-powerful old mentor guy with hidden secrets
- similar blend of comedy and action

- same fluffy hilarious romcom genre

- Both FLs have disguises and fake identities. Both dramas have boyish CEO MLs with traumatic backgrounds

- In both dramas, MLs know, like and respect the real identity of the FL and her work(ABP- Food research, INAR- inventor/enterpreneur) but don't know that the fake person standing jn front of them js actually that person.

- Both FLs have strong, supportive, fashionable best friends who fall in love with their love interests first and do the pursuing in the beginning

- Both FLs have huge crushes on their guy best friends(who have girlfriends) since high school and then learn to let go

- In both dramas, CEO MLs are boyish characters who have their own traumas and see the vulnerable side of an otherwise strong FL

- Both MLs have bromance with their secretaries

- Both FLs have good strong supportive funny best friends

- MLs use work and business trips as excuses to manufacture dates XD
- Both FLs are sooooo cute

- Both dramas are extremely fluffy romcoms that give instant dopamine boosts lol

- Both deal with a relationship that has lasted since high school

- Both deal with poverty and its effects on a relationship. 18 Again couple have the additional responsibility of children.

- Very realistic portrayal of the struggles and how they overcome them.

It's an idol variety show. It's hilarious. The boys have a very good sense of humor. Lots and lots of members to keep track of. LOL.

Similar nostalgic family genre. Similar inspiring/soothing OSTs. Lots of heartwarming sibling/family scenes. Go Ahead is funnier and more romantic. It also has MUCH better parent characters. Though most of the moms are trash, the dads are AMAZING. And lots and lots of eye candy with Steven Zhang, Seven Tan(Tan Songyun) and Song Weilong.

If you wanted more romance with Lee Je Hoon being his smoldering, adorable self, watch this one :) It's better than Where Stars Land, I promise.

same group of hilarious, chaotic, talented boys
the same banter, arguments, Haechan screaming, Jaemin being a dad, Mark being Milk.... it's DREAM at their best :)

Both leads have professional careers that we see a lot of.
Ml's older sister has a main arc in both dramas.
I feel like You Are My Hero is New Horizon's older sibling... YAMH is way more interesting but has the same feel.
You Are My Hero's romantic progression and plot strength is superior.