Once the Weather Is Good and the Wind Is Cold

Chief Assassin x Involution Apprentice Feng Han is the chief assassin of the Kara Continent Night Organization. No one knows where he came from. One night seven years ago, at the age of 16, he inexplicably reached the top of the assassin list. Whenever he embarks on a mission, he only succeeds. He comes and goes without a trace. No one knows his name. His codename "Shadow" has become a taboo that people dare not mention. But today, seven years later, Shiyi broke into his world. She came to the Assassin Academy and became the first female assassin to challenge the chief. He accepted his first apprentice, but Feng Han thought he was just too similar. Concept: Assassins are ruthless, swords should be careless