Reported about 1 year ago
As summer arrives, LINE has introduced a seasonal limited-time 'chat room special effect' where users can enjoy cute electronic fireworks by entering '3 keywords.' This allows people to experience the festive atmosphere of fireworks even if they couldn't attend a fireworks festival. The feature is available until July 8, 2024, for iOS 9.15.0 (and above), Android 10.2.0 (and above, with Android OS 7.1 and above). Users can replay the effect by tapping on the keyword link and can troubleshoot the effects by checking settings in the LINE chat room background effects section.
Source: YAHOO