I had huge expectations towards season 2 and is left disappointed.
The plot is deviating so much from the Manhwa. Significant characters are either removed (Teddy, Jimmy Bae, Jake Ji, Forrest etc) or just being fusioned (Colton x Phillip, Gotak x Gerrard).
Wolf Keum / Geum Seong-je character is also seemed to forced, unlike in the manwha. He is crazy as in Manhwa, but different.
Donald Na / Baek-jin is not terrifying at all as in Manhwa where no one dares to even look at his eyes. He looks just like a regular student with lil bit power. His sad background in manhwa is not there in the series. I feel like the union itself does not pose any threat or any reason to make people feared the union.
Then Si-Eun / Gray Yeon. Loved him in season 1, but not now. In season 1 and Manhwa, he portrayed the “White Mamba” character. In this season, he is just fighting brainlessly, no calculation, and just focusing on stabbing people. What made people feared him, respected him, and loved him is his full of calculation fighting style which made him a 100% win rate fighter with a weak body. His character as a weak hero here is not present.
The plot is also lots of mixed from each scene of the manhwa. Like the fried chicken store one as an example, thus no cohesive plot each episode. Lots of plot hole as well, weak story.