"What's wrong?" Serenity was puzzled to see Jackson stopping in his tracks.

"Nothing," Jackson looked back down and answered indifferently.

When they returned to the main house, Serenity asked, "How are you feeling right now?"

"Much better," he replied.

"Even if the gastric pain is an old sickness, you still have to find time to go to the doctor and get treatment," said Serenity, "If you don't take care of it, it might develop into something serious."

"Are you concerned about me, Sis?" he a