Answer:
He does not need to file a tax return
Explanation:
International students on F, J, M, or Q visas are considered “exempt individuals,” which means you are excused from the Substantial Presence Test for the first 5 years you are in the US if you are an international student. A substantial Presence test is the criterion used by the IRS (Internal Revenue Service) in the US to determine if an individual is a citizen for tax purposes or not. Since Wei came into the United States in 2014, and this is 2017 he has not yet exhausted the 5 year period.