Rachel Liu never thought that such an incredible thing as time travel would really happen, and she also met someone who looked exactly like Choi Young Do in this world. Fortunately, he was not Choi Young Do, he was a different person from Choi Young Do. Rachel Liu, the successor, traveled to the school in 2013 and met Park Heung Soo who looked the same as Choi Young Do but was completely different.
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