I was just going to come and share my experience with you - I'm in my mid-30's, and have tried both Sulwhasoo and Amore Pacific, and after some trial and error, have settled on the following which are working out really well for me - it was important for me to have my combo skin (normal-oily in summer and dry/normal in winter) well moisturized but also to have some kind of anti-aging properties in my skin care (I'm scared of Retin-A, lol). I also have sensitive skin which can break out and freak easily, as well as is redness prone when irritated, so I need gentle care.
Summer: Amore Pacific Time Response Creme Gel (it has a lighter but is still very moiturizing), Sulwhasoo Time Treasure Eye creme (the AP Time Response Eye creme does not agree with my eyes, for some weird reason, but the Sulwhasoo is lovely!). I use the AP Enzyme Peel once a week, and use the AP Cleansing Treatment Oil at night to take off make-up and use with my Clarisonic. I tried the AP Cleansing foam but found it too harsh for me. I sometimes also use the AP clarifying mask.
Winter (I'm on the US north east coast, so it gets really cold, and too much heating inside is a killer for the skin): same as summer, but I replace the Time Response Gel Creme with the Creme, and also add their Green Tea Seed Treatment Oil (that thing is simply fabulous, and I don't think I can ever live without anymore!) that I mix in with the creme.
I have tried the AP Time Response serum (as a deluxe sample) which is amazing, but at $500 a pop in addition to the above, I've decided to keep it in mind for later, when I'm older and need it even more, lol...
I have also been lucky enough to receive a GWP of the AP Time Response Hand creme - not a must, but lovely when received for free
I also tried from Sulwhasoo: the First Care Serum, and the Revitalizing Serum, but I felt it was a bit too heavy for my skin which broke out - but I loved the earthy smell of the line, very comforting, and I could still tell that they were lovely products. I just couldn't use everything together, and when I had to make a choice, kept the AP which seemed to agree better with my skin. The Sulwhasoo mask is really nice though, and I'm always happy to get samples of that one!
For some reason, I'm convinced that you will be able to find both AP and Sulwhasoo in Bangkok - try Central ****lom. Good luck, and let us know how you fare