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Operating right-of-use asset, net (Details)
 12 Months Ended
Mar. 31, 2023
USD ($)
Operating Right-of-use asset, net  
Total right-of-use assets, at cost, increase (decrease) $ 311,345
Total right-of-use assets, at cost 311,345
Accumulated amortization, increase (decrease) (138,272)
Accumulated amortization, exchange rate translation (277)
Less: accumulated amortization (138,549)
Right-of-use assets, net, increase (decrease) 173,073
Right-of-use assets, net, exchange rate translation (277)
Right-of-use assets, net $ 172,796
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Cash and Cash Equivalents, at Carrying Value
Operating lease, right-of-use assets period (in years) 12 months
Shenzhen Wan  
Operating Right-of-use asset, net  
Total right-of-use assets, at cost, increase (decrease) $ 211,765
Total right-of-use assets, at cost $ 211,765
Operating lease, right-of-use assets period (in years) 2 years
Longcheng Car  
Operating Right-of-use asset, net  
Total right-of-use assets, at cost $ 99,580
Operating lease, right-of-use assets period (in years) 14 months