Sun was promoted to Hangzhou Greentown's first team squad by Takeshi Okada in 2012.
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Although China U-20 qualified into the 2012 AFC U-19 Championship, he was sent off in the last match against Australia with a flagrant foul, which team manager Jan Olde Riekerink considered it as a disgraceful action and said he would never call up Sun for the U-20s squad in the future.
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