Tetsuo Kuroiwa is a teacher newly assigned to a high school ravaged by violence. Kuroiwa is authorized by the Minister of Education to carry a gun, and he wields his beloved Magnum to subdue the delinquents with overwhelming violence. After cleaning up one school, Kuroiwa moves on to the next. (Source: Mangapedia, translated) *Note: Dates based on tankoubon release.*

The Board of Directors at the Daitoku Automobile Corporation is locked in a bitter dispute over the appointment of a new director. Split between two factions, they seek the opinion of the company's founder, who is on his deathbed and only semi-conscious. The two men dispatched to solicit the founder's opinion get an unexpected response: "What ever happened to Namijirou Hira?" They don't realize that he was merely reminiscing about an old friend, and had no idea what the question was. And so, passing over many qualified candidates, the Board selects a nobody from a remote branch office—Mr. Namijirou Hira. (Source: Mangajin)

From MangaHelpers: Tanaka Ichirou's life is shaping up to be pretty horrible. Despite his hard work, he's not very good at his company job. In exchange for keeping his job, he is coerced into marrying an unwilling girl. The girl was impregnated by her lover, a man who was already engaged, and the company wanted to avoid a scandal. Now everyone abuses Tanaka at work, and he goes home to take out his frustration on his unhappy wife. To top it all off, some people are planning to put an end to the whole situation by having him killed. It is this last problem that brings him to the attention of a highly skilled ninja hitman, Shadow. Shadow is fleeing his criminal organization in search of a peaceful, normal, happy life. When he witnesses Tanaka's final moments, he decides to take the unfortunate man's life as his own. Will Shadow be able to find some kind of happiness in Tanaka's life, and will he be able to avoid his own past? [tethysdust]

The Silent Don has returned to modern-day Korea! The quiet man has another face— Jo Yongde, who works in the product development department of a cosmetics company, is clumsy and constantly failing at everything he does, making him an annoyance to those around him. Even when he gives a presentation in front of the company president, he only ends up making a fool of himself, leaving his manager and colleagues exasperated. The only one who warmly reaches out to him is his teammate, Sear. However, Yongde has another identity—he is the only son of a crime syndicate leader who controls the underworld. After his father is murdered, he takes over as the head of the organization. Yet, despite everything, Yongde continues to go to work at the company as if nothing has changed. What is he really thinking…? [Original Webtoon](https://series.naver.com/comic/detail.series?productNo=12508298) **Official Translations:** [Japanese](https://jp.piccoma.com/web/product/176484) ***Note:** This is Korean remake of [Shizukanaru Don](https://mangabaka.org/series/nq77a61/shizuka-naru-don).*