MTL - Shoujo Grand Summoning - ~ 1947 Leverage! Instant kill! ...

She was once the all-commanding queen of business, but when she woke up once more, she found herself disguised as the second young master of the Prime Minister’s residence!

The prosperity is about to come to an end, and the poor boy quietly rises.

Traveling across time and space, seek the leader of the world.

- Description from novelbuddy

In a world where everyone has a system, Liang Yu, who had lost his previous system, finally received a second one. This time, he was playing the second male lead instead of a cannon fodder.

He has one mission.

Bend the male lead.

Liang Yu: I can do this task just fine. But Lord God, please don’t drop the novel again.

- Description from Novelupdates

The story is about a man whose compulsive tendencies make it impossible for him to keep a job, and a young girl who skips school and loves insects. The two meet, come to support each other in reintegrating into society, and fall in love. There’s a problem, however: namely, the parasites in their heads.