The Solar Apocalypse

King Tristan, the King of a Rank-0 kingdom dies due to being betrayed by his only trusted man. Later, a young man from earth gets reincarnated in this new world of Ronin, in the body of King Tristan, and slowly uncovers the secrets regarding the fate of the universe in his run-down castle. Following, with the help of a system that can provide him with any knowledge he wants, with price as gold. He plans to develop his Kingdom into a haven able to shoulder the fate of heaven and earth with him. The novel is about a cataclysm and has SCI-FI that will be unraveled afterward in the novel.

Follow our protagonist Tristan, a cold, ruthless human as he overcomes all odds, solving all mysteries while slowly ascending the top, creating a safe haven. The ones who betrayed him shall beg him for the permission to enter his humble kingdom. The who betrayed his love shall mourn for his love. The ones who become his enemies will face a fate worse than death...cause it already fears him.
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Warnings:- The mc is quite intelligent and the romance is pathetically low, it is a long-term novel with quite a lot of real military tactics and kingdom-buildings. If you enjoy some young maidens' heartbreaks, cause the mc doesn't have time for romance and realistic kingdom building and military tactician wars and an all-knowing gold greedy system then this is for you.