Recommendations

They aren't exactly prequel and sequel but they have the same format:
- Main actors who play a fictionalized version of themselves.
- Every episode is a different story (and they are not related to each other).
- Every episode is directed and written by a different director and screenwriter.

Same director/screenwriter so they have similar editing style and sense of humor. In both the story is explained from the perspective of the main characters.
The actress Yukawa Hina is also a main lead in both.

Same director/screenwriter so they have similar editing style and sense of humor. In both the story is explained from the perspective of the main characters.

=> same male lead as played by Lee Joon Gi
=> Lee Joon Gi's characters are both suspected criminals
=> both dramas have adorable little girls, daughters of the male lead
=> the female love interests (mothers of male lead's daughters) don't know the criminal record of the male leads when they were dating
==> Trivia: both actresses for the love interests (Moon Chae Won in Flower od Evil and Park Ha Sun in Two Weeks) played as second leads in Han Hyo Joo's (Lee Joon Gi's love interest in Iljimae) dramas (Moon Chae Won in Brilliant Legacy/Shining Inheritance and Park Ha Sun in Dong Yi).
=> thriller drama with many plot twists and turns, most episodes keeps audience at edge of their seats
=> backstory romance of male lead and female love interests shown in pasts scenes throughout the drama
=> main difference: female lead in Flower of Evil is the detective investigating the male lead's case; while in Two Weeks, the female love interest has a detective fiance who investigates male lead's case along with a female prosecutor
==> female lead in Flower of Evil for me is like the composite character you get if you combined the female love interest, fiance detective, and female prosecutor from Two Weeks into one character.

Alternate story-telling of the 'Well-Intended Love'. Domineering CEO ML with obsession to his FL. Not nearly as fun as the first season.

For lovers of almost soap-opera romance drama watcher, where the MLs are the domineering CEO and nearly every side characters have something against the FL.

The plot basis is similar but 'Because This Is My First Life' handles mature subjects better and the characters, including the side characters, have more depth to them. One of my 10/10 dramas highly recommend!!

Both dramas feature an older rich woman/younger poor man dynamic and both dramas have a female CEO/boss who own entertainment companies (books, games, etc).

both the male leads are antique dealers or dealers in ancient artefacts. nice, cool romance story. both have an underlying supernatural element to them. both females have a curse or similar to a curse on them that the male lead wants to break.

The fl is weak but goal oriented n nice. The male lead is broken, Mysterious, playboy n handsome.mature plot n scenes n short drama n cliche ending.

Similar story line. Most importantly, our beloved Baifern is the female lead in both lakorns.

Both ‘Wish you’ and ‘Do you like Brahms?’ is about music, both have introverted characters and the overall cinematography and feeling is similar. The difference is that ‘Wish you’ is a BL while ‘Do you like Brahms?’ is straight love.

Both female lead are so nice, warm and kind like an angel. But the FL in Koe Koi is a little bit more shy with the ML than the other one.

Just as HILARIOUS, Great Chemistry ! Acting top Notch
Also on the fantasy side, you deal with a kind of "time travel body switch" thing :D
I LOVED EVERY BIT OF IT, the story line, the secondary characters ..

Both have supernatural concepts. (While Junkyouju Takatsuki Akira no Suisatsu is all about folklore and mystery, Boku wa Doko kara is not all about it). In both, shows, one of the main leads has possessed an ability through which they help the other main lead to solve cases. The bromance is strong in both of them, and they eventually grow closer and understand each other as the story progresses.