What is Korean lover game that turned fatal for Ghaziabad sisters and is it similar to Blue Whale Challenge that set 50 tasks over 50 days?

Deadly Korean Lover Game App: Three minor sisters addicted to a Korean task-based gaming app, popularly known as Korean lover game, died by suicide after jumping from the 9th floor of a building in Ghaziabad. The game, widely played on online platforms and mobiles, involves virtual interaction with a partner who assigns tasks. The case has turned the spotlight on the 'online suicide' game Blue Whale Challenge.