MTL - Conan’s World Stand-in - v2 Chapter 44 i need 1 explanation

Earth, the land that the constellations were aiming for.

Hunter Choi Yeonseung decided to start special training to stop the constellations that want to monopolize Earth. His training location was the Abyss, a space where time flowed infinitely slowly. However, Choi Yeonseung was suddenly caught up in a magical storm and had to face the harsh Abyss head-on.

Choi Yeonseung went through unprecedented and infinite practical training throughout the Abyss and discovered a clue to be the first human to become a constellation.

The hard-working hunter, Choi Yeonseung, was reborn safely as a constellation.

Will he be able to save Earth, which is destined to fall prey to the constellations?

The hard-working, overpowered martial artist, Choi Yeonseung! The path he walks on to become the first human constellation!

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- Description from Novelupdates

You had taken up the Student profession

You had now reached level 7.

Acquired skills: elementary school knowledge, junior school knowledge, and senior high school knowledge.

You took the university entrance exam and scored full marks.

Your have been upgraded to level 9, and you have activated the profession-change interface.

You became a scientist and gained R&D skills.

You used R&D skills and gained space fortress-building technology.

You used R&D skills and gained starship technology.

You are now invincible.