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Related party balances and transactions (Details) - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Related party balances and transactions      
Related party transactions $ 0 $ 0 $ 0
Luo Min      
Related party balances and transactions      
Relationship with the company Founder, chief executive officer and controlling shareholder of the Company