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I remember them as sunset's THU ICPC team.
That would be weird to name a team of students from Tsinghua as HDU and coach. Btw I recall that nickname for already some time, I was convinced these are some Chinese veterans.
One possible evidence is the CF reply from sunset: If you see the scoreboard of GP America, HDU-Coach is the only team which solved D and have unclear identity.
Of course, this is no definite proof :)
To put it into context, Xiuhan and Yuhao basically swapped their identities on Codeforces. I don't think you can believe them in any way xD
HDU-Coach : liuchunying, clrs97 as shown in the previous open cup overall standings. clrs97 seems to stand for Claris
Liu Chunying is the coach of HDU and HDU-Coach is the account of Claris. Maybe he did all contests with his team, or he just lends this account to a team without one. As I remember, only admins can change the team name since last time I was trying to do it but failed.