When he sensed Lotus Sun's gaze, Wang Ling quickly looked away and pretended that he was taking a casual look out the window.
But in any case, he had definitely been careless just now, and hadn't completely guarded against Lotus Sun's line of sight.
Wang Ling was indeed secretly observing Lotus Sun.
He wasn't looking at Lotus Sun's face, of course, but observing her reactions. Once Single's Curse was triggered, the effects of the curse would only disappear after a full three days, meaning that if there was a spell bug, it would show up in these three days.
So Wang Ling was curious as well as concerned that a bug might appear on Lotus Sun at any moment.
...
He was apprehensive all morning, but everything was fine so far and Lotus Sun still wasn't showing any reactions.