https://www.namecheap.com/domains/whois/results.aspx?domain=gainbitcoin.com

Registrant Name: Mark Lee
Registrant Organization: Gainbitcoin
Registrant Street: The Franklin, 3 Science park drive   
Registrant City: Singapore
Registrant State/Province: SG
Registrant Postal Code: 118223
Registrant Country: SG
Registrant Phone: +65.90795655
Registrant Phone Ext:
Registrant Fax:
Registrant Fax Ext:
Registrant Email: thegainbitcoin@gmail.com
Registry Admin ID:

https://twitter.com/theedge

This might be the owner as he mentions bitcoin 3 years ago and is also from Singapore - https://twitter.com/TheEdge/status/322762355706572800