If I 신고 somebody's stuff , do they lose their account ? 또는 I have to 신고 the 프로필 ?

No. Reporting someone's stuff only leads to it getting removed after being reviewed 의해 moderators. 당신 have to 신고 someone's 프로필 for them to possibly get banned.

Nope, if 당신 신고 a person's stuff the stuff will just get removed. If 당신 and a bunch of other people 신고 a person's profile, then that person would get banned.