Contract Summoning! I Summon the God of War Xingtian from the Start

Transmigration + urban high martial arts + invincible background + independent + invincible

The protagonist unexpectedly transmigrates into the body of Yang Jingyao, a person with the same name as him. The original Yang Jingyao was an orphan who lived in an orphanage. At the age of seven, he was adopted by a family who treated him very well. But one night, when Yang Jingyao was sixteen, a group of men in black broke into his home and killed his adoptive parents. He happened to be outside and escaped the disaster. Four hundred years ago, a huge rift appeared in outer space, and extraterrestrial demons poured out of it. At the same time, many smaller rifts appeared on Earth, from which more extraterrestrial demons emerged. In the second year, people began awakening classes and gaining the ability to contract summoned beasts. From levels 1 to 30, they make their first contract and level up by fighting monsters. At level 30, they awaken a class, and cannot awaken another afterward. At level 100, they can make a second contract; at level 150, a third; and at level 300, a fourth. Level 500 is the ultimate goal, allowing them to summon two beasts. The author is new, so please point out anything I've gotten wrong. I'll do my best to correct it and will carefully read everyone's comments to keep improving.