Recommendations

Both dark, psychological thriller genres and exploration of morally complex female characters driven by past trauma.

-Morally Ambiguous Protagonists

-The Use of a "Mask": In Mask Girl, the protagonist literally wears a mask while performing online to gain confidence and a different identity due to her appearance-based insecurities. In Dear X, Baek Ah-jin is a top actress who hides her cruel, true nature behind a beautiful, angelic public persona.

-Trauma as a Driving Force

-Focus on Consequences of their actions

In both dramas, the male lead travels with guilt of female lead's death or being unable to save her; also, while travelling to the past, they both unravel the mystery of FL's death.

Childhood best friends. The cool, smart one and his average, dorky friend - Yamato and Kakeru.
This is PEAKKKK!

Hioki, a second-year high school student, is separated from his close friends in class and finds himself alone when it comes to deciding on groups for the school trip. However, he is invited by a boy from the same junior high school to join a group of four handsome guys., who are known as the "Four Heavenly Kings." However, one of the four, Watarai, always looks out for Hioki, and they gradually become closer...and...rest you wiII find out

If you loved Top Star Yoo Baek, you’ll enjoy The Potato Lab too, it has the same comforting ‘city person heals in a rural place’ vibe, warm local characters, and a gentle romance that slowly grows in a peaceful countryside setting~ ?

Both drama, the male lead are like detective /police in the historical period. Both has funny comedy and serious elements. Both male leads are quirky, good looking, good martial art. Both female leads are cute, innocent a d pure at the beginning but grow to mature level

The main character's are similar; their experiences and the hidden identity. The neighborhood squads similar too, hilarious, smart.

A Continuation of the Encantadia Chronicles.
Crystal Bearers that protect the land of Encantadia which is seperate from our world.
One of the bearers, Terra, grows up on Earth but is then brought to save Encantadia by Pirena who was in the original show.
The return of foes from the first (rebooted series) series.
Familiar lands from the first (rebooted series) series.

Both are cute romance dramas that start when the characters are in high and develops until they're in university. Both drama relationships are light, fluffly and without much angst.

Investigation jdramas.
Set in departments that are looked down upon/essentially forgotten by the rest of the police.
— Aren't taken seriously, but are productive nonetheless.
Both focus on a new character joining this environment (FL in K, ML in BSS).
Quirky chaotic and comedic in setting and character.

The story of a father living with his children is reminiscent of the series "What Happens to My Family?" It has different scenarios, such as having two boys and two girls instead of two boys and one girl, and having a girl play the doctor character.

Similar bl undertones b/w male leads
one demon like ml, with burden of his past
one angel like ml who is attached to the demon always
demons holding 'stuff' on their backs, a major plot reveal based on it

completely different setups though

The FL is older, both of them were part of an online gaming group, and their first meeting felt awkward.
The different is My Dearest Nemesis was on office setting

Two dramas about solving mysteries. The important case is the death of a prince. This drama also features a female coroner - and, yes, she also starred in the drama Coroner's Diary.

both have rebirth, both have ML and FL fall in love, both have betrayal as a kickstarter/catalyst.
both done really well.