Espionage: I Have a Ghost Gate

[Espionage + Juntong + Wild Imagination + Multiple Heroines + Ruthless Action]

Zhong Kui, an elite soldier, had his soul transported into Shanghai in 1937, taking over the body of an action-team member of the Lixing Society who had just died. When his superiors learned he was alive and had assassinated several Japanese agents that very day, they promptly transferred him to the intelligence division. Codenamed Yama, he became a true intelligence agent.

Using his uncanny Ghost Gate, Zhong Kui hunted down and eliminated Japanese spies and 76th Division agents one by one, causing the Japanese intelligence operation to crumble completely and its networks to collapse, leaving the enemy under attack at every turn...

(The synopsis doesn't do it justice. Just read the story.)