Tom Yum starts off to the right of the second tier of roves above the Ton Sai main roof. Climb up the start past 2 bolts, split to the right and pass another bolt and a threaded cord to reach a bolted anchor on the right side of a small corner. This is a good route that is hard, but not as steep as other area routes, but its sketch factor makes it less enjoyable if it is a romp you are looking for.
To approach this route climb up the ladder near the Freedom Bar and up onto the shelf above the Ton Sai Roof. Walk right past Sweating Mekong and Viking In Heat, two steep routes just right of the top of the ladder and past an isolated route Hin Rong Hai, then scramble up a fixed rope to a slightly higher shelf, continuing to the right of another roof with some stalactites. To the right of the roof there is another set of bolted routes, which share the bottom 2 bolts. On the left is Silkcat, on the right is Tom Yum. Perhaps they have since been replaced, but as it was, the route earned its name, being quite spicy!
3 bolts + a sling to a bolted anchor