Question

The chapter opens up with a corpse(?) and the probable ML is doing something shady to it :D then he returns to his house(?) and looks at a board with some photos of seemingly random people. Then the author cuts to the scene where the mc finds his dead goldfish because he didn't take care of it properly…? Anyways his thoughts sound like something out of a 13yo kid’s diary, there's an attempt to get philosophical about a dead fish but overall it's very cringe. He claims that it's not his fault that he's ghosting somebody called Lee Suncheol?? He's ALSO is being stalked for two fucking weeks?? Later on we find out that Lee Suncheol is dead… so like, how do you ghost a dead guy? The dead guy’s coworker walks in like it's no biggie wtf. We also find out that MC is a prostitute with debt to pay so, male what you will out of that idc. Then we find out that MC has disturbing thoughts about killing people every day so that’s normal:)), anyways the dead guy’s coworker drives the MC to somebody’s place for some reason and later on gets murdered while MC gets fucked. Later on MC gets questioned by the police and he secretly gets happy because he sees this murder as a sign from god??

The first manga that I want to find is "You're realesed from the collar" or "Teareble collar".I couldn't find and I would want to read it if I can.It looked interesting.
The second manga that I want to find is one that I read.The story is about a introverted sucubus that is very old(I thing 1000 years old or more) and she made an app that would help her gain vitality from man.The first one that she tries the app on is an office man or something similar.She found out through the app that his kink was anal massage.He goes with him to "maximum level" then leaves him.The second man was a college student(or high school student) that was reading lewd things in the subway.The sucubus found out that his kink was being violated in the subway by a lot of men(it was a specific termen for this,but I forgot it).This was all I read at the time(it was work in progress)
I hope that someone can help me!