Despite different settings and main story, the dramas have similar vibe in terms of quirkiness and eccentric characters:

Both dramas are centered around very zany characters and bizarre/ absurd comedy.

The main themes of both dramas are found family and really strong friendships.

Both dramas are centered around the friendship of group of seemingly very different women. They share their hardships and happy days, they fight and then they make up but most importantly, they always have each others' back.
Both dramas sometimes contain similar story tropes but as main leads are in different age groups, these tropes get solved somewhat differently.

Both dramas have quite short episodes (WLDN 30 minutes, AOY 45 minutes per episode)

Age of Youth is about 5 flatmates in their early 20s. The drama is about their everyday life, college struggles and first loves. Each main lead represents some basic stereotype (there is girly girl, innocent shy girl, sexy minx, serious hardworking girl, free-spirited girl). The drama is more slice-of-life centered.

Work Later, Drink now is about 3 friends in their early 30s who drink together every day. They are somewhat losers - one of them is pretty but very stupid, one of them is a bit of a weirdo, the last one falls in love with pitiful men when shes drunk. The drama is more focused on ridiculous comedy and it is more adult oriented.

Both dramas follow lives of people who, after their busy work, head to a bar for a bottle (or two!) of soju. Both dramas focus on drinkig culture, food, everyday life issues and crazy epic friendship dynamics (for WLDN it's 3 main female leads, for DS it is Noryangjin male trio)

Both stories revolve around an old person magically returning back to their young selves and living their best life again.

Both are korean webdramas about soulmates.

Color Rush is colorblind soulmate AU (=one of the main leads is colorblind until he meets his significant other)

Dear My Name is soulmate-identifying marks AU (=everyone has a name of their soulmate written on their body).

Color Rush is a BL drama. Dear My Name is a hetero drama with female lead being quite tomboyish.

These dramas have very different setting (thai university - UWMA; office - ChM) but give off overall similar vibe:

Both are BL dramas with shy main lead and confident/perfect love interest who cares a lot about him.
The romance both dramas portray is very soft and cute.
Both dramas have fantasy element (reincarnation - UWMA; mind reading - ChM) and cute side-couple.

Both female leads have similar energy. Both are quite unlucky as well as get into embarassing situations.

Both dramas are centered around female character who makes a revenge on bad people.

Jigoku Shoujo is more magic/mystery based while Girl from Nowhere is more psychological.

Both dramas feature a main female lead who doesnt feel comfortable in her own body.

FL in Socialization is too tall, FL in WFKBJ is too strong. Both are athletes. Message is similar in both: Learn to love youself.

Socialization – Understanding of Dance is a drama special about two misfits who pair up and start dancing.

Yuwol: The Boy Who Made The World Dance is short student movie also focused on a one special boy who loves dancing.

Both have the same message: Dance like nobody's watching!

Both are thai BL dramas.

Both dramas focus on couple that has been dating for a long time (~3 years) and is not fully out yet and share topics like dating in secret, white lies, coming out, future and so on.

Both main couples share similar dynamics with one of them being a bit more passive and sort-of shy (Kao; Arthit) and the other being confident, rich and active (Pete; Kong).

Both dramas share the theme of finding home and hardships of house hunting that average people encounter.

Because This Is My First Life starts with main female lead trying to find a place to live and subsequently moving in with a housemate/contract husband.

Home Sweet Home depicts a story of an architect who is newly engaged and is trying to find suitable house of her dreams while not being rich.

Both stories have similar "real life" atmosphere and end up with life lesson.