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How many episodes have made contributions to diligence and know the truth?

Make contributions to Qin, episode 13, and know the truth. In episode 13 of "meritorious service", Sun learned the truth about Yu Min's identity. In meritorious service, Yu Min secretly studied hydrogen bombs for more than a year, during which he could only go home for one day. Sun vented all his grievances and doubts on the day when Min came home, and Yu Min felt deeply guilty. He can only comfort Sun that he is doing important things for the country, but Sun doesn't know what work Yu Min is doing. It was not until 13 that Yu Min's old colleagues came to the house to find Yu Min, and Sun Cai learned the truth about Yu Min's work from his colleagues.