After the discussion in the bathroom, Yi Chen ultimately decided not to involve "Yellow Skin" in the Nightmare Exploration and just let it rest well in the gentleman's clothes room.
There were two reasons,
1. Yellow Skin was an important medium for Yi Chen in future negotiations with the Skin Market. If it were forced to express its trait during the nightmare exploration and its existence discovered by the research institute, things would become very troublesome, and might even lead to a fatal danger.
2. Yellow Skin was also considered Yi Chen's "hidden ace." Combined with the gentleman's clothes, Yellow Skin could exert an unexpected skin effect. If this ace were revealed prematurely, there would be no advantage left when it was truly time to confront the nightmare's root.
However, another important entity attached to Yi Chen - Little Grape - was an exception. Little Grape's provided vision was extremely important; it might reveal some hidden things within the nightmare.
