Ren had come to realizer over time that he now had connections to this world...things tying him down.
And, instead of fighting against these chains that kept him in this new world, Ren embraced his new relationships, allowing him to form deeper bonds with Ruby, Raven, Zeng, Jin, and Han.
While this did come with drawbacks, as Ren could no longer only account for his survival but also those around him, complicating his plans, he wholeheartedly believed it was worth it.
Because...he was having fun.
Would the old Ren be back to run around in the snow with Ruby and have a campus-wide snowball fight?
Would the old Ren be able to lie down on the beach with his two subordinates while appreciating the beautiful sunset above?
No...he would be locked up in his room, planning or sleeping and suffering alone.
Smiling, Ren manifested three pairs of pitch-black sunglasses and placed them on Raven and Zeng's heads.
"So...you guys in?"