653-654 SZ and Madam Su are tending a bedridden SJY and cursing SL, while SX is kneeling at AL's door. While SZ despairs that AL would even ignore an Imperial Decree and his son has a slim chance of surviving, AL turns up at his door, stating SZ is lucky he has a good daughter (exact same trick as when NL arrived in ch310) and SZ assumes it’s SX. They converse while talking about different daughters.
655 SZ introduces AL to his wife, but MS is puzzled AL would actually show up since SX's presence was just for show. AL prepares SJY's medicine before leaving, telling SZ to personally administer it. SZ leaves MS with SJY, when Li Yao Chi (LYY's uncle) in the room.
656-657 In another residence, LYY, LAQ and LYX are plotting SL's demise, when a servant tells them about AL's trip to the Su Manor. However they can't harm AL since he'll become LYY's fellow apprentice (Senior Brother) if she's accepted as the disciple of the Master Apothecarist Róng Yún.
658-659 MS feeds SJY poison under LYC's orders. Both are working with the Jade Lake to pressure SL into leaving NL. SZ is shocked SJY's condition has worsened, sending SX to fetch AL since he supposedly has a favourable impression of her. SX is doubtful AL will respond since they've never met and shocked when he immediately leaves with her.
660-661 AL informs SZ that SJY has been poisoned. SZ finds it hard to beleive due to the short time frame since the last diagnosis, angering AL. AL states that the poison can only be cured with Celestial Spring Water - which LYC happens to have.
662-663 SZ has SL dragged over and demands she apologize to the Jade Lake family and beg them for the CSW. SL is angered since she isn't even worth a vial of CSW in his eyes (since she has a fountain). She takes some from her space and gives it to SZ. AL remarks her CSW is top quality, compared to LYC's low grade one, and SZ greedily questions SL over it. She hints it’s from NL, and SZ is irritated at LYC since NL clearly values SL and would’ve brought a lot of benefits. SL also notices the guilt in MS's eyes towards SJY.
664-667 LYC appears again, this time with LYY and seeing that MS is unwilling, demands that she either feeds SJY a fatal poison or one that can be treated. SZ catches MS in the act and summons AL when SJY's condition worsens. AL states that given his weakened state, the poison is fatal and MS is shocked since she had chosen the non-fatal one. SZ interrogates MS to find that she acted under LYY's orders and the first few illnesses were faked. Since he can't retaliate against the Jade Lake, he takes his anger out on her instead.
668 AL storms off, stating that the family is playing him and SZ sends SX to chase after him. Seeing MS lying on the floor in pain SL whispers to her that the last visit from LYY was her in disguise.
669-670 Explanation of latest scheme - SL repeatedly had SJY treated so MS would be backed into a corner by the Jade Lake. While giving SJY an actual poison was suitable retribution for initially faking his illness in order to send her off to the Jade Lake. Now the entire Su Family is neutralized. SZ and SX continue kneeling before AL's compound. Inside AL is serving SL his treasured tea which can help her breakthrough to fifth ranked expert, the minimum requirement to move from Elementary Apothecary to later stages.