honestly i've been flipflopping, but i think at the end of the day... sun-mi knows ivy and anu are going to go regardless because she has set of standard of letting them do whatever they want as long as she knows about it. so she would rationalize that going with them is the better option since she has ravi's mirror if anything happens.

but she does tend to start trying to be better about prefecting when ravi says something so that might complicate ghost hunting plans, yes.

tbh i always figured she would tell ravi before doing any of this stuff but based on ravi's reaction i am thinking that is a nooooooooo