OP MC who hides their strength

Setting: Modern times now has dungeon, gates, and Hunters
MC is the youngest survivor of the Great Dungeon (OP hunter)- went into hiding/trying to live like a normal person while fulfilling fallen comrades's wills (dying wishes)
*based of a korean LN
**full color
***slow burn BL

setting: modernworld now has dungeons/gates/hunters
MC is a 1st gen hunter who entered a gate- sole survivor and finds out it is now 8 yrs later...decides to live as a civilian (hangover soup store employee)
~MC's popular/hunter name "J" - now lives as his OG Korean name
*full color
**BL

Setting: modern world now has dungeons/gates/espers & guides- guideverse
Female MC who transmigrated to a ROFAN world for 7yrs and returned to modern world of guideverse,
now a cafe worker pretending to be a civillian (not a guide- MC is S rank guide) x S rank esper pretending to be low rank
*full color
* BG romance

MC was part of the party that defeated the ice queen. MC wakes up from being frozen- 20 yrs has passed
~MC's popular name "Spector" - now lives as his OG Korean name
*action - NO ROMANCE
*full color

Setting: was trapped in a video game- defeats a big boss allowing people to return to RL, but MC ends up going 200 years later in game world
Hides he is the "dark blacksmith high-human" and goes as a skilled adventurer "shin"
*based off LN
* has a game and anime- not great quality

setting: world with magic + magic academies + magic troops
MC =3rd rate magic teacher who is a slacker. He is actually really skilled (used to work for a secret top tier magic troop)
-has unique/quirky magic so by regular standards he is 3rd tier (bottome tier) magician, but in actual combat is OP
*has an anime-farther in plot
*has LN- more detailed