Yes, Tang Yan signed a contract with Ai Tie, and a goddess star like Tang Yan will endorse Ai Tie, which shows that she likes the effect of Ai Tie. Actually, I like Ai Ai Tie very much, because Ai Ai Tie is so easy to use. Ai Ai Tie can act on meridians of the whole body, improve blood circulation of body organs, promote local microcirculation, accelerate cell metabolism, warm uterus and dispel cold, replenish vitality, invigorate qi and blood, and regulate stomach and intestines.