The number of marks you see left in manhwa is abnormal. So don't take those as the basis. In fact, don't take anything you read in manhwa or books as standard for relationships. I've read some manhwa where I'm pretty sure the author has no idea how the male anatomy works. These are works of fiction and shouldn't be mistaken for realistic expectations. If, someday, you choose to be in a relationship, you can talk with them about leaving little to no marks. If they fight you on it, then they aren't worth your time.
manhwa grossly exaggerates the amount of marks left. a lot of times its actually dangerous to leave a lot of marks, as they're technically a type of injury. also if you don't enjoy that sort of thing, express it to your partner and if they ignore/reject that. leave that situation (*^^*)
Leaveing marks like that would hurt a lot so unless you are a masochists you wont get there. Also it's not so easy to leave marks like that and this amount...
Yk I've come to the realization while reading this that manhwa is the reason I'm afraid of doing it someday like look at those bruises and scratch marks and bites marks like I'll be too scared to sleep in the same room with my lover some day because this is something that'll eventually happen not that all leave scratch marks and bruises while doing it but it's still scary to think about I probably wouldn't be this afraid if I didn't read so many manhwa