If I buy a Monthly Plan Booster on day 30 of the Monthly Active Plan Cycle (Month 1 Day 30), can I continue to enjoy the offer after I renew my Monthly Active Plan (Month 2 Day 1)?

The expiry date of your Monthly Plan Booster will always be the same as your current month’s Monthly Active Plan date, which is Month 1 Day 30. Hence you may not be able to enjoy the Monthly Plan Booster on Month 2 Day 1 as it is already expired.