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Jin Youngwon was an unregistered sentinel (something like esper) who had not used his powers when he...
Actually this story is part of "Military Anthology" I've read it on other sites... it's already completed though with 6 chapters.
(Oh! I'm noting this down in case I forget..)
Btw. the story is good and amazing.... it's about sentinels and guiding. <(￣︶￣)>