It might be more natural to say: To provide for and protect his family, Loong joined a loan shark syndicate. A special task force assigned to wipe the syndicate out approached Loong, requesting him to gather criminal evidence of the syndicate secretly. While Loong was doing his undercover work, his sister joined the syndicate and befriended his sworn enemy Black Dog.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.