설명 : 앞으로 적용할 로그인에 대한 시나리오
//login system A
login and sign up is the same.
we do not need your information. that sign. e-mail. etc...
just. please login in 1 day. and 3 days. and 7 days.
and since then. always login in 7 days.
if you are not login.
account will be deleted.
//login system B
dynamic ID [free user]
- no password is required. and anyone can login.
- and we do not register a user ID. and PW.
static ID [payment user]
- just. if you payment user.
- we will register a user ID. and PW.