Go to Hell, White Lotus - Chapter 21 - The Immortal under the Peach Blossoms

A skilled but unfortunate modern-day assassin was killed in a freak accident. However, he soon found himself summoned to another world by an evil wizard, who had him possess the body of a boy as an experiment. After successfully planning the evil wizard’s downfall, he used the wizard’s body as a springboard to gain influence and power in his new world.

- Description from Novelupdates

Ling Fei, the son of a fisherman in Sanxian Island, was accidentally involved in a mysterious continent–Arad, after learning that his celestial destiny was shallow and that he had no way to ascend.

Sword, there are unique adventurers here. Ling Fei, who has just arrived, has a mysterious mission and an ancient blood. The silent Grand Forest is roaring, the ancient ruins of the king are lamenting, and it is unknown what the legendary headless horseman is chasing.

On the ground, Ling Fei gets acquainted with his partners, takes risks, and becomes a legend!

- Description from novelbuddy

A Mysterious continent, with many powerful sect and countless strong one. Juvenile Zhou Heng with a mysterious black broken sword, from the original stone town out into this world of war. Ascended the throne of the world with only a sword in hand.

- Description from Novelupdates

Volume 1 (Set between volumes 13 and 14)

A series of short stories set before the events of volume fourteen including how Team GROUP was formed.

Volume 2 (Set between volumes 16 and 17)

A series of short stories including two separate meetings between Touma’s and Mikoto’s parents, two tales involving two of the Level 5s of Academy City, and other funny stories involving some of the characters.