It’s a bit of both. At first he only wanted luck, then he realized that Tae was really genuine and fell in love with him. However, the reason he kept going after Tay was also because he hated losing to Ilay. It’s true that he did loved Tay for his genuine kindness, but that desperation he had of chasing Tae stemmed from possession and the fear of losing to Ilay. This is also mentioned in Passion Raga.

A question for those who have read the novel, guys Does Xinlu really love Taeui or he wants him for his luck or he just wanted to hurt Ilay by taking Taeui away from him? What’s his actual intention?