
Ok, everyone but bada is a player. They sucked at the game and 3 of them removed their tapes to forget the pain of dying over and over. Doha and fake cousin keep playing but they also kinda suck at the game. That's when they get a brilliant idea to use bada. In the beginning it starts with all 5 guys driving the car and bada comes on a motorcycle to bring his cousin his luggage he accidentally left. He's known as the harbinger (a character in a scary movie that warns the main characters of danger) They knock him out and bring him with them and they give him a tape so he turns into a player. Fake cousin decides he'll be the bate every round cause to him he can die quick and wake up with progress he didn't have to get on his own. Doha however stays with bada to keep playing (but bada doesnt know he's playing, they made the agreement to act as npcs around him) The cousin gets anxious that in the end only 1 person will escape so he removes Dohas tape thinking he's the closest to getting out. Then chapter 1 begins with bada playing the game and Doha not knowing he's in a game anymore, Doha finds his tape and plays it and then does the sexual torture with bada and dies. The next session Doha remembers everything and has also fallen in love with bada, he removes the cousins tape so he can't interfere with there love. Bada figures it out and the cousins tape is reinserted. The cousin tells bada everything and Doha kills him but not before the cousin says he's hidden badas tape and stabs him. Doha tells bada "I love u, i won't finish the game without u, I'll find your tape" or something similar to that. Now here we r with a confused bada. I did kinda skip over the other characters but its not super important but if you'd like I'll also explain if u want

Wait my comment got cut off
Just a small detail tho. Doha didn't find his original tape. He's starting on a blank tape. Sometime in ch7 he found a black cassette player while tagging along Bada's gameplay. He curiously inserts a tape, AND it just so happen that that cassette player had cousin's tape inside. So what happened was he found the player. (unknowingly) ejects cousin's tape and inserts his own blank tape. This was revealed on chap 40 if you want to read that part.
Also, the black cassette player is for the Abandoned House. (as per this rule: the player saves the game content; the tape saves the character's memories. You can refer to the author's note to read more about the game rules) So when Doha "played" his tape, the saved progress in the game in also unlocked. The NPCs also gain new dialogues because of the added content
You can read more in my compiled notes for the detailed chronological order of events: https://docs.google.com/document/u/0/d/1fyfND0KcEKCLjX-4X9l66b9U6diWfaakpy1NOWcA8mY/mobilebasic
So confused