No hate, I write cliche stuff too, Just going to list the cliche stuff I know, somewhat like a challenge. Feel free to add up something in the list.

1. Parents are homophobic.
2. Main lead/character came from the past. (Joseon Era)
3. Parents disapprove of the relationship.
4. Main character is dirt poor.
5. Main character's parents died.
6. Main lead is extravagantly rich.
7. Main lead is arrogant as -- is actually just a tsundere.
8. Second lead is main character's best friend.
9. Second lead is close to a saint.
10. Second lead is overly tolerant and easily forgives.
11. Overly protective dad.
12. Overly rude mom. 
    1. Take this money and leave my son for god.
    2. My son doesn't need someone like you in his life.
    3. I already agreed for you to be married with ________ the son/daughter of a very wealthy CEO of _____.
    4. This is unacceptable in the eyes of God!
13. Main character is naive and easily manipulated.
14. Main character is the most beautiful.
15. Main character is either overly dumb or overly smart.
16. Featuring best friends who act like they're on crack.
17. Main lead is the leader of a notorious gang.
18. Main lead is a mafia boss.
19. Main character is surrendered by parents to the main lead as offering.
20. Main lead is rude to main character, but despite this, the main character chooses the main lead instead of the overly nice second lead.
21. Second leads are portrayed pathetic af.
22. There is a marriage proposal or a wedding in the last chapter and they have a son/daughter.
23. Main lead in the kingka in school.
24. Third party antagonist is the queenka in school and is always a .
25. Either the main character or the lead gets in accident and has amnesia.
26. Obligatory hospital, "Don't die on me now." scene.
27. Main character asks second lead for help even though it's for the main lead. The second lead willingly helps btw because he loves main character so much.
28. Second lead takes care of main character when main lead is gone but the main character still loves the main lead. 
29. Arranged marriage of course with both main character and main lead hating on each other 'to the core'.
30. Arranged marriage because of dad/mom/granny/gramps friends' promise.
31. ABO verse where 'heat' brings the main lead and main character together.
32. The main lead in ABO verse has to be an omega.
33. Ridiculous prices of whatnots.
34. "______ is dead." told in a phone call. The phone drops from the character's hand ofc and knees go weak.
35. Main character is pregnant and doesn't tell the main lead after years later they meet in coincidence. The kid looks a lot like the main lead.
36. Someone works in a coffee shop.
37. Love-hate relationship.
38. "I'm jealous so I'll throw you on the bed to ravage you for making me feel this way."
39. Main character gets bullied.
40. Sometimes the main lead is the one bullying the main character.
41. They were childhood friends but one of them extremely changes personality when they grow up.
42. Main lead is a playboy.
43. I can actually count on my fingers how many fics I have read with people brushing their teeth before going to bed, waking up or going somewhere.
44. They were fated since the beginning of time.
45. A 'special item' connecting the characters together.
46. Main character is impatient as hell in .
    1. "Get on with it."
    2. "Stop teasing."
    3. "Please just me."
    4. " me so hard I forget my own name."
    5. "Make me scream your name so loud the neighbors will hear."

DISCLAIMER:
I'm not throwing shade on anyone because I write cliche stuff too,
these are just a list of cliche stuff I mostly see in dramas,
and some are exclusive in fics esp the last one :"D