On February 27, 2025, Suji Yan, founder of Mask Network, experienced a significant security breach resulting in the theft of over $4 million in cryptocurrency from his personal wallet. The incident occurred during his 29th birthday celebration, where his phone was briefly unattended, leading to suspicions of a possible offline attack. The stolen assets, including ETH, WETH, MASK, and USDT, were swiftly transferred and converted into approximately 1,700 ETH. Yan has engaged blockchain security firms and is cooperating with authorities to investigate the breach. This event underscores the critical importance of stringent security measures in managing digital assets.