Table:
text: List of football clubs in Hong Kong
S
S
Club League_Division Home_Ground Location_ Position_in_2012_13
Sunray Cave JC Sun Hei First Division Tsing Yi Sports Ground Tsing Yi , New Territories 7th, First Division
Sun Pegasus First Division Mong Kok Stadium Mong Kok , Kowloon 5th, First Division
Sun Source Third Division N/A N/A 4th, Fourth Division (promoted)

Question: Where was the location of Mong Kok Stadium among soccer clubs in south Hong Kong?

Question: from the list of soccer clubs in hong kong, in which league does sun source play?