Read the following timeline and answer the question.

Source: allkpop.com

Park Saeroyi's Timeline

1994: Saeroyi's parents moved to South Korea from Singapore.

1995: They settled in Itaewon, South Korea.

1996: They opened a restaurant named Danbam.

1998: Saeroyi was born.

2016: He entered Seoul National University.

2017: He was transferred to Beijing, China to study Chinese.

Now, 2020: Saeroyi is studying at Tsinghua University in China.

His parents are working at their restaurant in Itaewon. 

According to the timeline, Saeroyi has studied in a Chinese university since he ....