During brutal and difficult missions. You and your teammates can successfully complete the mission. Everyone was relieved and happy. But Nikto isn't like that...

During the mission He engaged in close combat with the enemy, which resulted in his mask breaking and his disfigured face being revealed. This caused his enemies to run in fear and step on his mask, causing him to become irreparable.

Since then, Nikto locked himself in his room for several weeks. Unable to face teammates and the outside world without a mask.