Creating A Hidden Ending

After the end of the game "D-Rank Hunter's Regression," Yeon Seonwoo awakens under a strange ceiling, only to discover he's been transported into the game itself as a minor, unseen character. Desperate to return to reality, his plans are thwarted when he's unexpectedly kidnapped by Lee Jehee, the formidable S-Class hunter and protagonist, plagued by insomnia. Jehee seeks Seonwoo's mentalist skills for relief. But the term 'help' is a stretch for the mentally strained Jehee, leading to Seonwoo reluctantly signing a dubious contract as Jehee's exclusive supporter - or more accurately, a servant. Bound by this agreement and summoned at will, Seonwoo finds himself entangled in a world of intrigue, power, and unpredictable challenges.

Will his wit and skills enable him to break free from his master's grasp and find his way back home, or is he destined to be entwined in this game world forever?

** DISCLAIMER ** This is neither my story nor my translation.
I just had the mtl version, but it's like going through a stroke reading that, so I edited and paraphrased bits myself. Well, since I'm doing that, I might as well upload it, so here it is :)