Since we haven't yet seen Mr Lin or fini, I'll give you a simple legal answer with the caveat that I haven't done any real study for a while. In any case such as this you need to see if it could be covered by the
Copyright, Designs and Patents Act 1988 (it should automatically go to the covered works) and essentially it doesn't really seem to fit into any of the categories because I doubt you could claim that there is sufficient originality in the layout or content for it to constitute an original literary work, the rest of the categories are even less suitable, except perhaps for that of a published edition where it may just constitute a typographical arrangement but that would be doubtful.
Since it fails the first test (that of being covered by the Act) there isn't too much point in continuing the analysis. He may have a better case if he is going to claim the old offence of "passing off" but he'd need to prove that there was goodwill in his website design, that you were misreprenting your website as his and finally that you were damaging the goodwill.
That's the legal side, morally I'm less than convinced it is good to have something so similar but they do say that imitation is the sincerest form of flattery.
