Hong Kong singer Yumiko Cheng was marooned in Shanghai after she left a wallet -- which contained all of her identification documents -- on a taxi there, and could only leave after she got all of it back.According to an Asian Entertainment Universe report, Cheng took to Weibo a few nights ago to share how she carelessly left her wallet on a taxi, and that she hoped a sincere person would find it and return it to her.She also wrote that all she wanted back was her Hong Kong ID card and 'Home Return Permit' back, otherwise she won't be able to come back to HK! Following that post, Yumiko then told followers on Weibo that she had found the taxi driver but she could not her wallet unfortunately.She went back to the location twice to search for it, but sadly came back empty-handed.Yumiko called herself a clumsy person and that she should really get a good punishment.She expressed the chances of finding the wallet is probably low, but she's still thankful for the help from her friends and fans. During a phone interview with a news outlet, she said she was terribly busy running around in Shanghai trying to report her losses and do the paperwork.She had planned to head back to Hong Kong last Tuesday (May 2) with her fiancé."My boyfriend has work, so he had to leave first. My wallet had, about HK$10,000 in cash, losing the money is fine, but reporting the losses of my ID card, Home Return Permit and driver's license is really troublesome. There are also my credit cards."Although I took action on reporting the losses fast, but because its the weekend, I'll have to wait at least 5 more days before I can get back to Hong Kong. Well, I guess I'm just going to visit my family."I have jobs engagements, but those could be adjusted. The impact is not big," she added.Yumiko blamed herself for being so careless and now she's suffering a huge consequence."I will really reflect on myself. I'm always treating the outside world like it's my own home. I leave my things lying everywhere."When asked whether he fiancé chided her for this, she replied: "No, I need to learn a lesson myself because he picked up after me so many times. Haha."Yumiko is walking around without a penny on her and she "feels awesome because I can finally rely on men.My parents gave me some money and my boyfriend left me some too before he went back to HK."