These stories have the dynamic you requested specifically:
No Moral
https://www.mangago.zone/read-manga/no_moral/
Kang Yise's Happy Ending
https://www.mangago.zone/read-manga/kang_isae_s_happy_ending/
Gig of the Day
https://www.mangago.zone/read-manga/daily_part_time_job/
Did It Work
https://www.mangago.zone/read-manga/did_it_work/
Cold-Blooded Beast
https://www.mangago.zone/read-manga/cold_blooded_beast/
These stories below have the dynamic you requested aloof x serious just opp, as in uke is serious and seme is aloof
Boss Bitch Baby
https://www.mangago.zone/read-manga/boss_bitch_baby/
The Dawn Split The Night
https://www.mangago.zone/read-manga/the_dawn_split_the_night_ilovecheetos/
The Man Next Door
https://www.mangago.zone/read-manga/the_man_next_door/
enjoy (｡•ᴗ-)✧
I fucking love you
(っ˘з(˘⌣˘ )
BLs similar to
https://www.mangago.zone/read-manga/little_mushroom/
In terms of personalities and character dynamics. Like emotionless, care free, aloof (I mean aloof, not stupid) MC x intimidating, authoritative ML
But like in a cute way, not a rapey, toxic way. Idc about the art, the plot, etc, I just want this kind of dynamic.