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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($)
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES      
Revenue $ 6,311,725 $ 1,772,502 $ 6,959,372
Commission service      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES      
Revenue 96,332 82,054 0
Recommendation service      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES      
Revenue 0 0 3,754,738
Interest income      
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES      
Revenue $ 215,393 $ 1,690,448 $ 3,043,096