What if I opened the door like this?

SELECT * FROM gallery2 WHERE topic_id="668938" UNION SELECT * FROM gallery2 WHERE topic_id="1203229" UNION SELECT * FROM gallery2 WHERE topic_id="1361185" UNION SELECT * FROM gallery2 WHERE topic_id="593948" UNION SELECT * FROM gallery2 WHERE topic_id="1358829" UNION SELECT * FROM gallery2 WHERE topic_id="58465" UNION SELECT * FROM gallery2 WHERE topic_id="571559" UNION SELECT * FROM gallery2 WHERE topic_id="824212" UNION SELECT * FROM gallery2 WHERE topic_id="1173656" UNION SELECT * FROM gallery2 WHERE topic_id="1368006" UNION SELECT * FROM gallery2 WHERE topic_id="57091" UNION SELECT * FROM gallery2 WHERE topic_id="1480861" UNION SELECT * FROM gallery2 WHERE topic_id="1029532" UNION SELECT * FROM gallery2 WHERE topic_id="1087891" UNION SELECT * FROM gallery2 WHERE topic_id="1292407" UNION SELECT * FROM gallery2 WHERE topic_id="190298"