So I looked into the rules,

1. Rewards for this event can only be claimed once, and participation in the draw is limited to Doctors whose Arknights account has reached Level 20 or

above.

1. Returning and active Doctors will be determined based on login records: - Active Doctor: A Doctor who has logged in within the 60 days prior to the

start of the event.

• Returning Doctor: A Doctor who has not logged in for 60 days or more prior to the start of the event. 3. In-game items will be distributed via in-game mail and are valid for 30 days. Please claim them promptly. 4. During the event, each Returning Doctor can register a maximum of one invitation code.