I am that male friend in the harem story - Chapter 5: Ishigami can only be obedient

A failed investor from 2017 got drunk and woke up in the 1980s. China is just opening up, and the economy is blooming. There is also the dissolution of the Soviet Union, the bursting of the Dot-com bubble and other financial crisis. He used his knowledge of the future and slowly build up his empire.

What? Your future wife is a peerless killer, an underground queen?

Sorry, just killed her the other day.

…

I heard that your girlfriend is the famous champion of China, the dream lover of countless people?

Um, she was too tired and fell asleep at night, you can come to her tomorrow.

…

I remember that the abandoned store of the second uncle seemed to be bought by someone in a month or two.

Hurry up and exchange the useless places in the training house with your cousin for the abandoned store.

Then resold at a price of 10 million alliance coins.

…

What?

Xu Yang rescued a legendary elf and took care of it for a month.

Yi Lam knocked Xu Yang unconscious with a sap and threw him out.

The legendary elf who regained consciousness saw Edward Lam.

He was so grateful to him that he willingly became Edward Lam’s elf.

- Description from novelbuddy

Some say reincarnation is a blessing, but for me, it's a dreadful curse. Cursed with endless reincarnation, I've been reborn as a villain 137 times. And all 137 times, I've been toyed with and killed by heroes who are far more cruel than the said villains... If I can't win no matter what I do, then I'll crush those so-called heroes at their very roots. - Quality Fan Translations, Made by Fans for the Fans - Villain Takes Over The Academy

Left out during the elementary school picnic.