Mongil: Star Dive is running a May Surprise Log-in Rewards Event with daily mail rewards from the notice posting on April 30 through May 5 at 01:59 UTC.
Rewards are tied to specific login windows. Each reward can be claimed once per account, and missed days cannot be claimed later.
Event Schedule
| Reward claim period (UTC) | Reward |
|---|---|
| After notice posting on 4/30 (Thu) - 5/1 (Fri) 01:59 | Blue Upgrade Stone x1 |
| 5/1 (Fri) 02:00 - 5/2 (Sat) 01:59 | Conquest Entry Ticket x1 |
| 5/2 (Sat) 02:00 - 5/3 (Sun) 01:59 | Rift Entry Ticket x1 |
| 5/3 (Sun) 02:00 - 5/4 (Mon) 01:59 | Conquest Entry Ticket x1 |
| 5/4 (Mon) 02:00 - 5/5 (Tue) 01:59 | Rift Entry Ticket x1 |
How to Claim
Log in during the active reward window and check Mail. Netmarble says rewards are only delivered when logging in during the designated time period.
Expired or deleted mail rewards cannot be restored through support, according to the event notice.
What Players Should Know
The event is simple, but the timing matters. The two Rift Entry Ticket and Conquest Entry Ticket windows are separated by daily reset-style time blocks, so logging in once at the end of the event will not recover earlier rewards.
Source
Details come from the official May Surprise Log-in Rewards Event.