The world's best engineer

You're an ordinary student living an ordinary life, but suddenly you find yourself transported to the world of the perfect engineer. It's the world of a manhwa where Lloyd Frontera and Gavier Asrahan are the protagonists. Lloyd is the reincarnation of the Iron Knight, possessing a system of magical beasts and a love of money. Xavier is Lloyd's loyal knight, known for his high morals. They are best friends, but they are always fighting. Javier is very handsome, while Lloyd is so ugly it's nauseating, so Javier never misses an opportunity to laugh at Lloyd whenever someone calls him ugly. You found yourself in that manhwa and you have a system like Lloyd's, so what would you do?