MTL - The Return of the Black Technology of Immortal World - v3 Chapter 289 significance

Once upon a time, a hero had been summoned to a different world in order to defeat the demon king. After the war stretching 3 years ended the commendable hero slew the demon king. And he was forcibly deported back to earth after being dismissed.

Such bullshit!

Elves in addition to beast race, dwarfs and demon race. Even though I wanted to make a harem in the different world I saved! My dream will not come true on earth, where there is no magic at all. Thus, the hero returns on his own. Without the blunder of being extradited to earth this time, he will build a harem of his own in a different world.

what did you say?
Your mobile phone eight-core processor? 6G running memory? 256G storage? One and a half hours full of electricity?
Very great?
Our mobile phone 16-core processor, 12G running memory, 1T storage, can be fully charged in just 10 minutes!
what did you say?
Your charging treasure 30,000 mAh capacity? Two-way fast charge?
Sorry, our charging treasure has a capacity of 100,000 mAh. As for the two-way fast charging technology… Our 10,000 mAh mobile phone can be fully charged in just ten minutes. Can you tell me two-way fast charging technology?
what did you say? Our products are defective?
Come here! Come over and try, let you see how to kill you in minutes!
Super electronics, super cars, super buildings…
Since Lin Yun acquired the universe trading system, various industries began to get a strong impact…
Money is just a trail, and force is fundamental!
You said that Lin Yun’s goal is to dominate the earth?
Do not! Do not! Do not! You are wrong, his goal is the sea of stars

- Description from uukanshu (translated)

One day, Lin Tian, an 18-year-old high school student, accidentally binds with a producer system. As long as he binds with a partner and cultivates them into a super “idol,” he can receive rewards. When he meets the equally eccentric and obsessive cellist Gan Yanyu, they hit it off immediately and start creating short videos, striving to achieve the highest honor in music competitions!Thus,In a season of cherry blossoms, just after winning an international competition, Gan Yanyu plays a piece that Lin Tian has never heard before on the stage in front of thousands of spectators.To Lin Tian's astonishment, the young girl puts down her bow and beams a radiant smile.“You’ve written so many pieces for me; this one is my composition for you.”“It’s called—‘Love Letter.’”