Does membership guarantee tickets?

No — it usually unlocks a chance window only.

Can I share one membership?

Against most terms and a common ban reason for event entry.

Fandom · K-pop 팬클럽·멤버십 등급 설명 (위버스 등)

Tingkat fanclub & membership K-pop

Presale access is the most common paid benefit; timing still depends on each concert notice.
Kit contents (card, decals) ship on their own schedule — membership can be active digitally before the parcel arrives.
Japan FC often needs a Japanese address or proxy; benefits rarely transfer 1:1 to a Korea Weverse club.
Cancel/renew windows matter for continuous membership numbers used in some lotteries.