Introvert
Part of speech: noun
Definition: One who focuses primarily on their own mind, feelings, or affairs.
Example sentence: G-Dragon is a fancy person. People don't expect the upright image of G-Dragon. Kwon Ji Yong is an introvert and has lots of things going on in his head.
Invaginate
Part of speech: verb
Definition: To fold up or enclose into a sheath-like or pouch-like structure, either naturally or as part of a surgical procedure.To turn or fold inwardly.Infolding to create a hollow space where none had existed, as with a gastrula forming from a blastula.