Hapdong is a new name to me. It sounds like an East Asian reissue of - well, something, but I have no idea what. (The stated scale doesn't help much. We had a most interesting discussion here in the Forum recently about the various plastic H.M.S. Victory kits on the market. It turned out that scarcely any of them were actually on the scales the boxes claimed.)
Quite a few companies have issued plastic Cutty Sark kits over the years. (I'm assuming this is a plastic kit; is that correct?) The ones I can think of off the top of my head are Revell (three kits on different scales), Imai (on two scales), Monogram, Academy, Aurora, Pyro, and Airfix (on two scales). I suspect there have been others. And several of those kits have been reissued under the labels of other manufacturers. (The two Imai ones are currently available in Aoshima and Revell Germany boxes, and I believe the larger Imai kit appeared briefly under the Monogram label.) Do you have the facility to post some pictures? If so, somebody might recognize this Hapdong one.
Youth, talent, hard work, and enthusiasm are no match for old age and treachery.