Synopsis: this-assassin-is-upright

The assassin you imagine: sneaking in silence, lurking in the shadows, emerging from the corner to strike with lethal precision, and vanishing without a trace. But Yu Zhun’s code is different: declaring loudly like a chuunibyou (delusional teenager), "My name is Yu Zhun, and I'm here to kill you today!" One-hit kill! One-hit kill!! One-hit kill!!! The most useless SSS-rank assassin talent, yet in Yu Zhun's hands, it becomes the strongest! (AC.QQ, translated) Original Webtoon Official Translations: Japanese