Translation:

UltraTVXQ came across this while searching- recruit Shim Changmin had given an autograph to one of his fellow batchmates for his girlfriend and there he wrote to have a long, long pretty love. the recipient had written about it, while laughing hard.

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Credits:

Fanaccount via @UltraTVXQ,
Translated by @snxy,
Shared by TVXQ! Express