His brother was Tung Kang. He was Lord Hung's body guard. When Lord Hung was killed, his brother got the map.
9 seconds sound clip from the Dragon connection (1980) movie soundboard.
You can hear this line at 00:31:35 in the DVD version of the movie.
Quote context
[...]
- Don't worry. He's busy with the captain.
- No, not yet. I even searched through all his clothes. There's not a sign.
- Hey, do you think that his daughter might have it?
- I searched her place while she was out.
- Damn it. I'm sure he's got it.
- Yes, all right. I'll get dressed first. Well, come on.
- Damn it. Although that dummy looks simple, he's quite smart.
[...]