Eulachacha Waikiki (2018)

Both dramas are about being young and having dreams, when all life seem to be still in front. However, in GBC it is also shown, that not all dreams can come true and your life can turn out completely different than you imagined.
GBC and EW both have similar kind of humour, but also include touching and sad moments.
Also, if you liked Lee Joon Ki in Eulachacha Waikiki, in GBC there is a very similar character played by the same actor, Lee Yi Kyung.
GBC is more about family, while EW is more about friendship, but in general they have a similar feel to them.

There's random elements that are similar. Both dramas have female leads that like to play hide and seek when drunk. They also both have a name game to verify compatibility between characters. The pace is also somewhat similar. I prefer Eulachacha Waikiki, but Beautiful Gong Shim is good too.

Both drama are comedy that deals with ridiculous events in everyday life. In both drama the main character tries to achieve his dream but finds himself failing for various reasons. Family, friendship and love dynamics that are always under the prism of humour. Some touching moments on the very top to mix it all together.

It has similar vibes because happiness avoids the main characters! And both are very funny! Nothing works as they would like.
Hanging On is about the family and Waikiki is about the friends who run the guesthouse.

it is also funny like Welcome to Waikiki and the bond of friendship was shown in this show.
also show friends to lovers just like Waikiki and based on life, romance, and comedy.

They aren't really similar in the feels as Welcome to Waikiki is much funnier, but they are both lovable and feel good. They both are similar in the found family aspect with all the characters being unique and weird in their on way. Thirty but Seventeen has some very funny moments too yet also sometimes makes you want to cry. Just a little but you have been warned.

They are both about multiple men learning how to take care of a baby on their own. 8Uppers is a little bit more serious than Waikiki, but they are both funny.

Eulachacha Waikiki and Twenty are both centered around friendship and brotherhood. Both are also very funny and contain a romance aspect.

similarities:

-- centers around a group of friends that are more like family
-- instead of a guesthouse it's ramyun shop
-- quirky characters ALL ROUND

differences:
--focuses more on romance that waikiki and there's a main couple where as waikiki gives everyone equal screen time
--a little bit more emotional heft--not that waikiki doesn't have that but it's dealt with differently

Both the shows have ML falling for the FL who is a single mother.The interactions of MLs and babies is soo cute?

The plots are similar because they deal with three men and a mysterious baby. Neither of them is father though, I think.