I suggest you issue a notice/legal letter clarifying the return of the money to Mr.K along with a cross cheque/DD for the said amount in his favour. Since there was no agreement signed, you are free to conduct sale of the property for which you hold a clear title. From what you've mentioned, in my opinion Mr. K has accrued no right/title/interest in the property and thus cannot legally stop you from conducting sale of the property.
Best of luck!
DISCLAIMER: The guidance provided above by the lawyers is based solely on the limited information made available to them by the respective querist. These answers are general guidelines and not specific legal advice or legal opinion. All answers are made in individual capacity and do not reflect the opinions of any employer or organisation. Kindly refer to MyLegalWork's Terms & Conditions of use.
Thanks for the information, our executive will contact you in a while.
email@example.com | +91 9508888989