Unparalleled Comprehension Begins With Using My Lifespan

Caleb, a former US Marine sniper, found himself betrayed by his squad and was murdered. He believed that was the end, but he awoke in the body of a boy known as Caleb Li on Blue Earth. Caleb Li had also been betrayed, this time by his girlfriend who sought his family heirloom, a jade pendant with the ability to harness mysterious energy and grant its wearer immense power. Naive in love, Caleb Li had shared his secret with his girlfriend, ultimately leading to his demise. Now, it was the new Caleb's turn to take charge. With his military experience, he would ensure he wouldn't make the same mistake that led to his death. With this new life, he vowed to take a new path that solely belong to him. But first, he must complete the most horrifying trial in the Ancient realm if he wanted to forge a path that solely belong to him. As he entered the Ancient World and awakened his innate talent, his life took another dramatic turn. [Ding!] [You've awakened the Lifespan System.] [Ding!] [Host is advised to accumulate more lifespan to reach full potential.] [Insufficient lifespan. Host will die in 1 hour.] Thus began Caleb's race for more lifespan. Along his journey, he gradually discovered that his transmigration was not a mere coincidence. A hidden secret, inextricably linked to his stolen jade pendant, awaited him.