Doing XXX with the Wall-Fixed Part-timer

Falling for his senior's persuasion, university student Minyul invested not only his entire savings but also borrowed money into cryptocurrency, only to end up completely ruined. Feeling utterly lost and crying out in despair, his senior introduces him to a peculiar part-time job. "I can recommend a job that pays quite well if you just close your eyes and work for exactly one month... but... sigh, it's not your ordinary part-time job." "What is it?" "...It's like a unique part-time job. Hanging on a wall." To pay off his debt, he decides to try this 'wall-fixed' part-time job, said to have incredibly high hourly wages and tips. Hanging on a wall should be a piece of cake, right? But wh...